Question 1 :
Assertion: A step up transformer can also be used as a step down transformer.
Reason: This is because $\cfrac { { E }_{ p } }{ { E }_{ s } } =\cfrac { { n }_{ s } }{ { n }_{ p } } $
Question 2 :
A step up transformer operates on a $230V$ line and supplies to a load $2A$. The ratio of primary to secondary windings is $1:25$. Determine the primary current.
Question 3 :
In an oscillating LC circuit the maximum charge on the capacitor is $Q$. The charge on capacitor when the energy is stored equally between electric and magnetic field is :
Question 4 :
The current which does not contribute to the power consumed in an AC circuit is called:
Question 5 :
In a circuit $LC = 10^{-3}H, C = 10^{-3} F$. Find angular frequency.<br/>
Question 6 :
$Transformer \rightarrow ideal \rightarrow E_{P} = 1000\ V, I_{P} = 50A$<br>$220V \rightarrow 80\ houses$<br>Resistance of secondary coil will be
Question 7 :
If $V=100 \sin 100t$ volt, and $I=100 \sin(100t+\dfrac {\pi}{6})A$. then find the watt less power in watt?
Question 8 :
A certain series resonant circuit has a bandwidth of $2 kHz$. If the existing coil is replaced with one having a higher value of $Q$, the bandwidth will<br/>
Question 9 :
A transformer is used to light a $120 W$,$24 V$lamp from$240 V$a.c. mains. The current in the main cableis$0.6 A$.The efficiency of the transformer is
Question 10 :
A device that increases the voltage of an alternating current is called a(n)
Question 11 :
In a step-down transformer the secondary coil has .............. number of turns.<br><br>
Question 12 :
A transformer steps up an $AC$supply from$220 V$to$2200V$. If the secondary coil of the transformer has$2000$turns, the number of turns in its primary coil will be:
Question 13 :
In an ideal parallel LC circuit, the capacitor is charged by connecting it to a DC source which is then disconnected. The current in the circuit
Question 14 :
What do we name the  device which increases the emf ?<br/>
Question 15 :
A transformer connected to $220$ volt line shows an output of $2A$ at $11000V$. The efficiency is $100$%. The current drawn from the line is:
Question 16 :
In a $LC$ circuit. Angular frequency at resonance is $w$. What will be the new angular frequency when inductor's introduces is made $2$ times and capacitance is made $4$ times?
Question 17 :
A step down transformer changes the high input voltage used in our houses $(120V)$ into the low voltage used to charge an electric razor $(24V)$. What must be the ratio of the turns of wire from the primary side of the transformer to the secondary side?
Question 18 :
Whenthe values of inductance and capacitance in an $L-C$ circuit are $0.5\ H$ and $8\ \mu$F respectively then currentinthe circuit is maximum. The angular frequency ofalternatinge.m.f. applied in the circuit will be
Question 19 :
A step up transformer converts $100$ V at primary to $300$ V at secondary.  If the primary current is $6$A, then the secondary current is ______A
Question 20 :
The correct formula for the angular frequency $\omega_0$ of an $L-C$ resonant circuit is
Question 23 :
In a transformer, the number of turns of primary coiland secondary coil are 5 and 4 respectively. If 220V is applied on the primary coil, then the ratio ofprimary current to the secondary current is :
Question 26 :
In a step-up transformer, the number of turns in the primary are .................. than the number turns in the secondary.
Question 28 :
A transformer having $4000$ turns on its primary side and $500$ turns on the secondary side. If the input voltage is $240\ V$, find out the output voltage of the secondary side of the transformer ?
Question 29 :
What would be the Q factor for a purely inductive circuit?
Question 30 :
The primary and secondary coils of a transformer<br>have 50 and 1500 turns respectively. If the<br>magnetic flux linked with the primary coil is<br>given by $\phi =\phi _{0}+4t,$ where $\phi$ is in webers, t is<br>time in seconds and $\phi_{0}$ is a constant, the output<br>voltage across the secondary coil is:<br><br><br><br><br><br>
Question 33 :
Assertion (A): More the turns more is the<br>resistance<br>Reason(R): Impedance of primary and secondary<br>in a transformer is directly proportional to number<br>of turns in the coils.<br><br>
Question 34 :
A circuit has a self-inductance of $1H$ and carries a current of $2A$. To prevent sparking, when the circuit is switched off, a capacitor which can withstand $400\ V$ is used. The least capacitance of the capacitor connected across the switch must be equal to
Question 36 :
If the resistance in a parallel resonant circuit is reduced, the bandwidth:
Question 37 :
Match the following<br/>a) step up transformer     d) turns ratio is 1<br/>b) step down transformer e) Ns > Np<br/>c) Ideal transformer           f) Np > Ns<br/>
Question 38 :
The ratio of the secondary to the primary turns in a transformer is $3:2$ and the output power is $P$. Neglecting all power losses, the input power must be:<span class="_wysihtml5-temp">
Question 39 :
A step-down transformer reduces the voltage of a transmission line from $2200\ V$ to $220\ V$. The power delivered by it is $880\ W$ and its efficiency is $88$%. The input current is :
Question 41 :
The ratio between the primary voltage and the secondary voltage in a transformer is equal to:<br/>
Question 43 :
In an ac circuit with voltage V and current I, the power dissipated is
Question 44 :
The power loss in an $AC$ circuit is $E_{rms}$ $I_{rms}$, when in the circuit there is only
Question 45 :
An inductance, a capacitance and a resistance are connected in series across a source of alternating voltages. At resonance, the applied voltage and the current flowing through the circuit will have a phase difference of<br/>
Question 46 :
An alternating voltage frequency $\omega$ is induced in electric circuit consisting of an inductance $L$ and capacitance $C$, connected in parallel. Then across the inductance coil the<br>(i) current is maximum when ${\omega}^{2}=1/(LC)$<br>(ii) current is minimum when${\omega}^{2}=1/(LC)$<br>(iii) voltage is minimum when${\omega}^{2}=1/(LC)$<br>(iv) voltage is maximum when${\omega}^{2}=1/(LC)$
Question 48 :
Thesharpness of resonance in a series $L-C-R$ resonantcircuit,as the resistance of the circuit is increased,goeson
Question 50 :
If a stepup transformer develops 400V in secondary coil for an input of 200V A.C, then the current in the transformer is :<br/>
Question 51 :
In an $L-C-R$ series circuit, the values of $R, X_{L}$ and $X_{C}$ are $120\Omega, 180\Omega$ and $130\Omega$, what is the impedance of the circuit?
Question 52 :
1MW power is to be delivered from a power station to a town 10 km away. One usesa pair of Cu wires of radius 0.5 cm for this purpose. Calculate the fraction ofohmic losses to power transmitted if a step-up transformer is used to boost thevoltage to 11000 V, power transmitted, then a step-down transformer is used tobring voltage to 220 V. $(\rho_{Cu} \, = \, 1.7 \, \times \, 10^{-8} \, SI \, unit)$
Question 53 :
In series $LCR$ circuit, in the condition of resonance, if $C=1\mu F;L=1H$ then frequency will be:
Question 54 :
A coil of inductance 0.20 H is connected in series with a switch and a cell of emf 1.6 V. The total resistance of the circuit is $.40\Omega$. What is the initial rate of growth of the current when the switch is closed?
Question 55 :
When an a.c. source of e.m.f. $E={ E }_{ 0 }sin 100t$ is connected across a circuit, it is observed that voltage leads the current by a phase angle $\frac { \pi  }{ 4 } $. It the circuit consists possible only R-l, R-C or L-C in series the two elements could be:
Question 56 :
In series $L-C-R$ circuit, the resonating frequency is 600 Hz.The half power points are at 650Hz and 550 Hz.The quality factor is:
Question 57 :
A resistor R, inductor L and a capacitor C are connected in series to an oscillator of frequency v. If the resonant frequency is $v_r$, then the current lags behind the voltage, when:
Question 58 :
The ratio of turns in primary and secondary coils of a transformer is 1:10. The ratio of currents in primary and secondary coils will be
Question 59 :
A step down transformer reduces $220V$ to $110V$. The primary and secondary current are 5 and 9 amperes respectively. The efficiency of transformer is
Question 60 :
Voltage induced in the secondary coil of a transformeris mainly due to :
Question 61 :
In an LCR circuit the potential difference between the terminal of the inductance is $60\ V$, between the terminals of the capacitor is $30\ V$ and that between the terminals of the resistance is $40\ V$. The supply voltage will be equal to:
Question 62 :
State whether given statement is True or False<br/>In order to get maximum power transfer from a capacitive source, the load must have an impedance that is the complex conjugate of the source impedance.
Question 63 :
An arc lamp requires a direct current of 10A at 80V to function. If it is connected to a 220V (rms), 50 Hz AC supply, the series inductor needed for it to work is close to:<br>
Question 64 :
If in a transformer the number of turns of primary coil and secondary coil are $5$ and $4$ respectively and $240$ V is applied to primary coil, then the ratio of current in primary and secondary coil is :
Question 65 :
In an ideal parallel LC circuit, the capacitor is charged by connecting it to a D.C. source whichis then disconnected. The current in the circuit
Question 66 :
Assertion: In series $L-C-R$ $AC$ circuit, current and voltage are in same phase at resonance.
Reason: In series $L-C-R$ $AC$ circuit, resonant frequency does not depend on the value of resistance. Hence current, at resonance, does not depend on resistance.
Question 67 :
In a circuit, $L,C,R$ connected in series with an alternating voltage source of frequency $f$. The current leads the voltage by $\displaystyle 45^{\circ}$. The value of $C$ is
Question 68 :
A transformer having the efficiency of $90\%$ is working on $200\, V$ and $3\, kW$ power supply. If the current in thesecondary coil is $6\, A$, the voltage across the secondary coil and the current in the primary coil respectivelyare :
Question 69 :
A $6 kHz$ sinusoidal voltage is applied to a series RC circuit. The frequency of the voltage across the resistor is<br/>
Question 70 :
An electrical heater and a capacitor are joined in series across a $220 V,$ $50 Hz$ $AC$ supply. The potential difference across the heater is $90 V$. The potential difference across the capacitor will be about
Question 72 :
An L-C-R circuit contains $R=50\Omega $, $L=1 mH$ and $C=0.1\mu F$. The impedence of the circuit will be minimum for a frequency of
Question 73 :
A certain step-up transformer has $400$ turns in the primary winding and $2,000$ turns in the secondary winding. The turns ratio is<br/>
Question 74 :
An ideal transformer is used on 220 V line to deliver 2 A at 110 V. The current through the primary is :
Question 75 :
The output voltage of a transformer connected to $220$ volt line is $1100$ volt at $2$ amp current. Its efficiency is $100\%$. The current coming from the line is
Question 76 :
In a series resonant $LCR$circuit, the voltage across $R$ is $100\ volts$ and $R = 1k\ \Omega $ with $C=2\ \mu F$. The resonant frequency is $200\ rad/s$. At resonance the voltage across $L$is<br>
Question 77 :
A step-up transformer has a transformation ratio of $3:2$. What is the voltage in secondary, if the voltage in a primary is $30V$?
Question 78 :
In an electric circuit the applied alternating emf is given by $\displaystyle E = 100\sin(314t) $ volts and current flowing $\displaystyle I = \sin \left(314t + \dfrac{\pi}{3}\right)$, Then,the impedance of the circuit is $(in\ \Omega)$
Question 79 :
The number of turns in the coil of an AC generator is 5000 and the area of the coil is$0.25 \ m^2.$ The coil is rotated at the rate of 100 cycles /sec in the magnetic field of $0.2 W/m^2$. then the peak value will be :
Question 80 :
The emf and current in a circuit are such that $E=E_{0}sin\omega t $ and $I=I_{0}sin(\omega t-\theta )$ . This AC circuit contains :<br/>
Question 81 :
Acharged 30 $\mu$F capacitor is connected to a 27 mH inductor. The angularfrequency of free oscillations of the circuit is
Question 82 : <p>In an LC circuit the capacitor has maximum charge q<span class="wysiwyg-font-size-small">0. The value of ${\left( {\cfrac{{dI}}{{dt}}} \right)_{\max }}$ is</p>
Question 83 :
A step up transformer is connected on the primary side to a rechargeable battery which can deliver a large current. If a bulb is connected in the secondary, then<br/>
Question 84 :
Assertion: the power in an ac circuit is minimum if the circuit has only a resistor
Reason: Power of a circuit is independent of the phase angle
Question 85 :
If the frequency of the AC source connected across a series LCR circuit is continuously in which the following is observed. Assume all other parameters are kept the same.
Question 86 :
If $R = 100\ \Omega,\ L = 10\ mH$ and $C = 10^{-4}\ F$. the value of resonant frequency will be nearly
Question 87 :
The instantaneous value of emf and current in an<br/>A.C. circuit are; $E=1.414sin\left ( 100\pi t-\frac{\pi }{4} \right )$ ,<br/>$I=0.707sin(100\pi t)$ . The current,<br/>
Question 88 :
A transistor-oscillator using a resonant circuitwith an inductor L (of negligible resistance) anda capacitor C in series produce oscillations offrequency f. If L is doubled and C is changed to4C, the frequency will be:-
Question 89 :
What is the Q factor of a series circuit that resonates at $6 kHz$, has equal reactance of $4 k\Omega$ each, and a resistor value of $50 \Omega$?
Question 90 :
In a series LCR circuit $R=300\Omega, L=0.9H, C=2\mu F, \omega =1000$rad/s. The impedance of the circuit is?
Question 91 :
A power transformer is used to set up an alternating emf of $220V$ to $4.4kV$ to transmit $6.6kW$ of power. The primary coil has $1000$ turns. What is current rating of secondary? (Assume efficiency 100%)
Question 92 :
L, C and R represent inductance, capacitance and resistance respectively. Which of the following have dimensions of frequency ?
Question 93 :
State whether given statement is True or False<br/>A step-up transformer steps up power.
Question 94 :
The primary of a transformer has 40 turns and works on 100 volt and 100 watt. Then the number of turns in the secondary to step up voltage to 400V  and the current in the secondary and primary will be
Question 96 :
In an LCR circuit inductance is changed from $L$ to $\dfrac{L}{2}$. To keep the same resonance frequency, $C$ should be changed to<br/>
Question 97 :
At grid sub-stations the voltage is stepped up to reduce loss of
Question 98 :
A transformer has turn ratio $100/1.$ If secondary coil has $4$ ampcurrent then current in primary coil is
Question 99 :
 In a series resonant L-C-R circuit, the voltage across R is 100 V and $R =1 k \, \Omega$ with $C = 2\mu F$. The resonant frequency is 200 $rads^{-1}$. At resonance the voltage across L is :<br/>
Question 100 :
An LCR circuit is connected to a source of alternating current. At resonance, the applied voltage and the current flowing through the circuit will have a phase difference of <br/>
Question 101 :
In an oscillating $L-C$ circuit in which $C=4.00\mu F$, the maximum potential across the capacitor during the oscillations is $1.50V$ and the maximum current through the inductor is $50.0mA$. How much time does the charge on the capacitor take to rise from zero to its maximum value?
Question 102 :
An inductor coil stores $U$ energy when $i$ current is passed through it and dissipates energy at the rate of $P$.  The time constant of the circuit, when this coil is connected across a battery of zero internal resistance is :
Question 103 :
A coil has an inductance of 0.7H and is joined inseries with a resistance of 220 $\Omega $ . When analternating e.m.f. of 220V at 50 c.p.s. is appliedto it, then the wattless component of the currentin the circuit is<br>
Question 104 :
If the total charge stored in the LC circuit is $\mathrm{Q}_{0}$, then for $\mathrm{t}\geq 0$<br/>
Question 105 :
An alternating current of $1.5mA$ and angular frequency $300\ rad/sec$ flows through a $10K\Omega$ resistor and a $0.50\mu F$ capacitor in series. find the rms voltage across the capacitor and impedance of the circuit?
Question 106 :
$S_1$: In an elastic collision initial and final K.E. of system will be same.<br>$S_2$: In a pure $L-C$ Circuit average energy stored in capacitor is zero.<br>$S_3$: In $YDSE$ coherent sources are formed by division of wave front method.<br>$S_4$: If a physical Quantity is quantized then it must be integral multiple of it's lowest value.
Question 107 :
A transformer has 500 primary turns and 10 secondary turns. If the secondary has resistive load of 15 $\Omega$, the currents in the primary and secondary respectively, are:
Question 108 :
In an oscillating $L-C$ circuit, the maximum charge on the capacitor is $Q$. The charge on the capacitor, when the energy is stored equally between the electric and magnetic field is:
Question 109 :
In a series LCR circuit R=200 Omega and the voltage and the frequency of the main supply is 220 V and 50 Hz respectively. On taking out the capacitance from the circuit the current lags behind the voltage by 300. On taking out the inductor from the circuit the current leads the voltage by 300. The power dissipated in the LCR circuit is
Question 110 :
A resistor and a capacitor are connected to an ac supply of $200\space V, \space 50\space Hz$ in series. The current in the circuit is $2\space A$. If the power consumed in the circuit is $100\space W$ then the capacitance in the circuit is:
Question 111 :
A RC series circuit of R$=15\Omega$ and $C=10\mu F$ is connected to $20$ volt DC supply for very long time. Then capacitor is disconnected from circuit and connected to inductor of $10$mH. Find amplitude of current.
Question 112 :
In series LCR circuit $R = 18\Omega$ and impedance is $33\Omega$. An r.m.s. voltage $220\ V$ is applied across the circuit. The true power consumed in a.c. circuit is
Question 113 :
An ideal choke takes a current of $10\space A$ when connected to an ac supply of $125\space V$ and $50\space Hz$. A pure resistor under the same conditions takes a current of $12.5\space A$. If the two are connected to an ac supply of $100\space V$ and $40\space Hz$, then the current in series combination of above resistor and inductor is
Question 114 :
Assertion: Potential difference across, resistor, capacitor and inductor each is $10V$. Then, voltage function and current functions should be in phase.
Reason: At this condition current in the circuit should be maximum.
Question 115 :
Assertion: A resistance is connected to an ac source. Now a capacitor is included in the series circuit. The average power absorbed by the resistance will remain same.  Reason: By including a capacitor or an inductor in the circuit average power across resistor does not change.
Question 116 :
When a series combination of $L$ and $R$ are connected with a $10V$, $50HZ$ A.C. source, a current 1A flows in the circuit. The voltage leads the current by a phase angle of $\pi/3$ radian. Then the resistance is<br>
Question 117 :
In series $LCR$ circuit voltage drop across resistance is $8\space V$, across inductor is $6\space V$ and across capacitor is $12\space V$. Then
Question 118 :
A coil, a capacitor and an $AC$ source of rms voltage $24V$ are connected in series. By varying the frequency of the source, a maximum rms current of $6A$ is observed. If coil is connected to a dc battery of emf $12$ volt and internal resistance $4\Omega$, then current through it in steady state is :<br/>
Question 119 :
If resistance is removed from the circuit and the value of inductance is doubled, the variation of current with time in the new circuit is:
Question 120 :
The ratio of the secondary to the primary turns in a transformer is $3 : 2$ and the output power is $P$. Neglecting all power losses, the input power must be<br/>
Question 121 : <p>In a series L-C-R circuit the voltage across the resistance , capacitance and inductance is 10 V each. If capacitance is short circuited, the voltage across the inductance will be:</p>
Question 122 :
An inductor and a resistor are connected to an ac supply of $50 V$ and $50 Hz$. If the voltage across the resistor is $40 V$ the voltage across the inductor will be:
Question 123 :
A 100 volt A.C. source of frequency 500 hertz is connected to a L-C-R circuit with L $=$ 8.1 millihenry, C $=$ 12.5 microfarad and R $=$ 10 ohm, all connected in series. The potential difference across the resistance will be:<br/>
Question 124 :
The power developed in the circuit of a $2500\space \mu F$ capacitor that is connected in series with the coil is:
Question 125 :
Statement-1 : An emf $\varepsilon=\varepsilon_0 sin \left ( \omega t + \frac{\pi}{6} \right )$ is applied in a circuit and a current $i=i_0  sin  \left ( \omega t - \frac{\pi}{3} \right )$ flows. Then the average power delivered by the source is zero.<br/>Statement-2 : If   the average  value of  $\varepsilon $  and $ i$ is separately  zero,  then  the  power  consumed  will be  zero.<br/>
Question 126 :
A $750Hz, 20 V$ source is connected to aresistance of $100\Omega$, an inductance of $0.1803H$and a capacitance of $10\mu F$, all in series. Thetime in which the resistance (thermal capacity $=2J/^{0}C$) will get heated by $10^{0}C$ is<br>
Question 127 :
An LC circuit initially oscillates with frequency 'f' and the maximum current in the circuit is $i_{max}.$ If the total energy of the circuit is increased to twice of its initial value, then <br>
Question 129 :
When an alternating voltage of $220V$ is applied across a device $P$, a current of $0.25A$ flows through the circuit and it leads the applied voltage by an angle $\pi/2$ radian. When the same voltage source is connected across another device $Q$, the same current is observed in the circuit but in phase with the applied voltage. What is the current when the same source is connected across a series combination of $P$ and $Q$?<br>
Question 130 :
Which of the following combination should be selected for better turning of an L.C.R circuit used for communication?
Question 131 :
Assertion: Average power consumed in an ac circuit is equal to average power consumed by resistors in the circuit.
Reason: Average power consumed by capacitor and inductor is zero.<br/>
Question 132 :
In an oscillating $L-C$ circuit in which $C=4.00\mu F$, the maximum potential across the capacitor during the oscillations is $1.50V$ and the maximum current through the inductor is $50.0mA$. What is the inductance $L$?
Question 133 :
Two different coils have self inductance $L_{1}=8$ <br> $mH$ and $L_{2}=2$ <br> $mH$. The currents in both are increasing at the same constant rate. At a certain instant of time, the power given to the two coils is the same. At this moment the current, the induced voltage and energy stored in the first coil are $i_{1}$ , $V_{1}$ and $U_{1}$ respectively. The corresponding values in the second coil are $i_{2}$, $V_{2}$ and $U_{2}$  respectively. Then the values of $\dfrac{i_{1}}{i_{2}},\dfrac{V_{1}}{V_{2}}$ and $\dfrac{U_{1}}{U_{2}}$ are respectively :<br/>
Question 134 :
An $LCR$ series circuit with $R=100\Omega$ is connected to a $200\ V,50\ Hz$ a.c source. When only the capacitance is removed, the current leads the voltage by $60^{o}$. When only the inductance is removed, the current leads the voltage by $60^{o}$. The current in the circuit is :
Question 135 :
An AC source of variable frequency is appliedacross a series L-C-R circuit. At a frequencydouble the resonance frequency, the impedanceis $\sqrt{10}$ times the minimum impedance. Theinductive reactance is<br>
Question 136 :
The voltage across the capacitor as a function of time is given by $10^xt^2\ V$,then find $x$.
Question 138 :
The primary winding of a transformer has 500 turns where as its secondary has 5000 turns. The primary is connected to an a.c. supply of 20V, 50 Hz. The secondary will have an output of
Question 139 :
An $L-C$ circuit consists of an inductor of $L=0.0900H$ and a capacitor of $C=4\times {10}^{-4}F$. The initial charge on the capacitor is $5.00\mu C$ and the initial current in the inductor is zero. When the current in the inductor has half its maximum value, what is the energy stored in the inductor?
Question 140 :
In an LCR circuit L, C, and R values are respectively 8 Henry, $0.5 \mu F$ and $100\Omega$ are arranged in series. The resonating frequency is:
Question 141 :
The primary and secondary coil of a transformer have $50$ and $1500$ turns respectively. If the magnetic flux $\phi$linked with primary coil is given by $\phi = \phi_0 + 4t$, where is in webers, $t$ is time in seconds and $\phi$ is a constant, the output voltage across the secondary coil is:
Question 142 :
A capacitor has a resistance of $1200  M\Omega$ and capacitance of $22  \mu F$. When connected to an AC supply of frequency 80Hz, the alternating voltage supply required to drive a current of 10 virtual amperes is<br/>
Question 143 :
A 20V, 750 Hz source is connected to a series combination of R $=$ 100$\Omega $, C $=$ 10 $\mu F $ and  $L $=$ 0.1803  H$. Calculate the time in which resistance will get heated by $10^{o}$C. (If thermal capacity of the material $=$ 2 J / $^o$C )<br/>
Question 144 :
Assertion: In series $LCR$ circuit if a ferromagnetic rod is inserted inside an inductor, current in the circuit may be increase or decrease.
Reason: By doing so $X_L$ will increase.
Question 145 :
Assertion: In series $L-C-R$ circuit, voltage will lead the current function for frequency greater than the resonance frequency.
Reason: At resonance frequency, phase difference between current function and voltage function is zero.
Question 146 :
Assertion: Resonance frequency will decrease in $LCR$ series circuit if a dielectric slab is inserted in between the plates of the capacitor.
Reason: By doing so, capacity of capacitor will increase.
Question 147 :
A choke coil and capacitor are connected in series and the current through the combination is maximum for AC of frequency n. If they are connected in parallel, at what frequency is the current through the combination minimum?<br>
Question 148 :
A capacitor of $10\space \mu F$ and an inductor of $1\space H$ are joined in series. An ac of $50\space Hz$ is applied to this combination. What is the impedance of the combination?
Question 149 :
If a transformer have turn ratio $5$ , frequency $50 Hz$ root mean square value of potential difference on primary $100$ volts and the resistance of the secondary winding is $500 \Omega $ then the peak value of voltage in secondary winding will be (the efficiency of the transformer is hundred percent)
Question 150 :
A charged capacitor discharges through a resistance R with time constant $ \tau $. The two are now placed in series across an AC source of angular frequency $\displaystyle \omega = \frac {1} {\tau} $ . The impedance of the circuit will be:
