Question 1 : <span class="wysiwyg-font-size-small"><span class="wysiwyg-font-size-small"><p class="wysiwyg-text-align-left">When air is replaced by a dielectric medium of constant $K$, the capacity of the condenser:</p>
Question 2 :
When a thin mica sheet is placed between the plates of a condenser then the amount of charge, so compared to its previous value, on its plates will become:
Question 3 :
Which material sheet should be placed between the plates of a parallel plate condenser in order to increase its capacitance ?
Question 4 :
When a dielectric is introduced between the plates of a condenser, the capacity of condenser :<br/>
Question 5 :
A sheet of aluminium foil of negligible thickness is introduced between the plates of a capacitor. The capacitance of the capacitor :<br/>
Question 7 :
A parallel plate capacitor is charged. If the plates are pulled apart
Question 8 :
The capacity of a parallel plate capacitor with no dielectric substance but with a separation of $0.4cm$ is $2\mu F$. If the separation is reduced to half and it is filled with a dielectric substance of value $2.8$, then the final capacity of the capacitor is
Question 9 :
A capacitor consists of two metal plates each$10{\text{ }}cm$ by$20{\text{ }}cm;$ they are separated by a$2.0{\text{ }}mm$ thick insulator with dielectric constant$4.1$ and dielectric strength 6.0107 V/m. What is the capacitance in$pF\left( {{{10}^{ - 12}}F} \right)?$<br>
Question 10 :
A parallel plate capacitor C is charged by connecting it to a battery using a switch S as shown in the figure, Now S is opened and the plate separation is then increased. As a result:
Question 11 :
Displacement current goes through the gap between the plates of a capacitor when the charge of the capacitor
Question 12 :
If on combining two charged bodies, the current does not flow then :<br/>
Question 13 :
A parallel plate capacitor is charged and then isolated. What is the effect of increasing the plate separation on charge, potential, capacitance, respectively?<br>
Question 14 : <span class="wysiwyg-font-size-small"><span class="wysiwyg-font-size-small"><p class="wysiwyg-text-align-left">In a parallel plate condenser if the distance between the plates is made half and the dielectric constant is doubled, then the capacity increases by a factor:</p>
Question 15 :
If the inductance and capacitance are both doubled in L-C-R circuit, the resonant frequency of the circuit will :
Question 17 : <span class="wysiwyg-font-size-small"><span class="wysiwyg-font-size-small"><p class="wysiwyg-text-align-left">The capacity of a parallel plate condenser consisting of two plates each of $10\ cm^2$, separated by a distance of $2\ mm$ is:</p><p class="wysiwyg-text-align-left">(Take air as the medium between the plates)</p>
Question 18 :
Two parallel plate air capacitors have the same separation. The plates of the first are squares of side 10 cm. The plates of the second are squares of side 20 cm. The ratio of their capacitance is :
Question 19 :
A capacitor of capacitance $2\ \mu F$ is charged to a voltage of $6\  V$. The charge on its plates is:
Question 20 : <span class="wysiwyg-font-size-small"><span class="wysiwyg-font-size-small"><p class="wysiwyg-text-align-left">Force acting upon a charged particle kept between the plates of a charged condenser is F.If one of the plates of the condenser is removed,force acting on the same particle will become</p>
Question 21 : <span class="wysiwyg-font-size-small"><span class="wysiwyg-font-size-small"><p class="wysiwyg-text-align-left">Select correct Statements : </p><p class="wysiwyg-text-align-left">a) Charge cannot be isolated</p><p class="wysiwyg-text-align-left">b) Repulsion is the sure test to know the presence of charge</p><p class="wysiwyg-text-align-left">c) Waxed paper is dielectric in paper capacitor</p><p class="wysiwyg-text-align-left">d) Variable capacitor is used in tuning circuits in radio</p>
Question 22 : <p class="wysiwyg-text-align-left"><span class="wysiwyg-font-size-small"><span class="wysiwyg-font-size-small">Three capacitors $2\mu F, 3\mu F$ and $5\mu F$ <span class="wysiwyg-font-size-small"><span class="wysiwyg-font-size-small">are connected in parallel. The capacitance of the combination:</p>
Question 23 : <p class="wysiwyg-text-align-left">There are $10$ condensers each of capacity $5\; \mu F$. The ratio of minimum to maximum capacity obtained from these condensers will be :<br/></p>
Question 24 : <p class="wysiwyg-text-align-left"><span class="wysiwyg-font-size-small"><span class="wysiwyg-font-size-small">To obtain $3 \mu F$<i><span class="wysiwyg-font-size-medium"><span class="wysiwyg-font-size-medium"> </i><span class="wysiwyg-font-size-small"><span class="wysiwyg-font-size-small">capacity from three capacitors of <span class="wysiwyg-font-size-medium"><span class="wysiwyg-font-size-medium"><span class="wysiwyg-font-size-small">$2 \mu F$<i><span class="wysiwyg-font-size-medium"><span class="wysiwyg-font-size-medium"> </i><span class="wysiwyg-font-size-small"><span class="wysiwyg-font-size-small">each, they will be arranged as follows:</p>
Question 25 :
From a supply of identical capacitors rated $8\ \mu F, 250\ V$, the minimum number of capacitors required to form a composite $16\ \mu F, 1000\ V$ capacitor is:
Question 26 :
Two capacitors of $1\mu F$ and $2\mu F$ are connected in series and this combination is changed upto a potential difference of $120$ volt. What will be the potential difference across $1 \mu F$ capacitor:
Question 27 :
Four capacitors of equal capacitance have an equivalent capacitance ${ C }_{ 1 }$ when connected in series and an equivalent capacitance ${ C }_{ 2 }$ when connected in parallel. The ratio $\dfrac { { C }_{ 1 } }{ { C }_{ 2 } } $ is
Question 28 :
For capacitors in the series combination, the total capacitance C is given by<br/><br/>
Question 29 :
Find the total capacitance for three capacitors of $10$f,$15$f and $35$f in parallel with each other?
Question 30 :
Two capacitors of capacity $C_1$ and $C_2$ are connected in parallel, then the equivalent capacity is:
Question 31 : <span class="wysiwyg-font-size-small"><span class="wysiwyg-font-size-small"><p class="wysiwyg-text-align-left">In a charged capacitor the energy is stored in<b>:</b></p><b><span class="wysiwyg-font-size-small"><span class="wysiwyg-font-size-small"></b>
Question 32 :
Two parallel-plate of capacitor have charges +Q and -Q and potential difference $\triangle V$ due to charging, Now the capacitor is disconnected then the potential difference and the stored electrical potential energy is:
Question 33 :
A potential difference of $\Delta V$exists between two plates of a parallel-plate capacitor with capacitance C . A dielectric with a dielectric constant of kis then placed between the plates of the capacitor. What is the energy stored in the capacitor?
Question 34 :
If the charge on the condenser of $10\mu F$ is doubled, then the energy stored in it becomes ____________.
Question 35 :
A capacitor having capacity of $2.0\mu F$ is charged to $200\ V$ and then the plates of the capacitors are connected to a resistance wire. The heat produced in joule will be :
Question 36 :
The capacity of a condenser is 20$\mu F$ $\displaystyle $ and the potential is 20 V. The energy released an discharging it fully will be
Question 37 :
A $2 \mu F$ capacitor is charged to $100 V$ and then its plates are connected by a conducting wire, the heat produced is :
Question 38 :
The energy stored in a capacitor of capacitance C having a charge Q under a potential $V$ is
Question 39 :
The amount of work done is increasing the voltage across the plates of a capacitor from $5V$ to $10V$ is $W$. The work done in increasing it from $10V$ to $15V$ will be :
Question 40 :
The potential energy of system of two equal negative point charges of $2\mu C$ each held 1 m apart in air is ($k = 9 \times 10^9\, SI \,unit$)
Question 41 :
The capacitance of a variable capacitor joined with the battery of $100$V is changed from $2\mu F$ to $10\mu F$. What is the change in the energy stored in it?
Question 42 :
The capacity of a condenser is $4 \times 10^{-6}$ farad and its potential is 100 volts. The energy released on discharging it fully will be
Question 43 :
The energy stored in a capacitor of capacitance $C$ having a charge $Q$ under a potential $V$ is
Question 44 :
A capacitor of capacity C$_{1}$ charged up to V volt and then connected to an uncharged capacitor C$_{2}$.Then final P.D. across each will be:
Question 45 :
$R=100\ k\Omega$ and $C=1\ \mu F$ are connected in a series with a $12\ volt$ battery. What is the maximum energy stored in the capacitor:
Question 46 :
A metallic sphere of radius $18cm$ has been given a charge of $5\times { 10 }^{ -6 }C$. The energy of the charged conductor is :
Question 47 :
A 16 pF capacitor is connected to 70 V supply. The amount of electric energy stored in the capacitor is:
Question 48 :
If a capacitor having capacitance of $1200\mu F$ is charged at a uniform rate of $100\mu C/s$, what is the time required to increase its potential by $20$ volts?
Question 49 :
A parallel plate capacitor of $1\mu F$ capacity is discharging through a resister. If its energy reduces to half in one second. The value of resistance will be?
Question 50 : <span class="wysiwyg-font-size-small"><span class="wysiwyg-font-size-small"><p class="wysiwyg-text-align-left">The energy stored in a sphere of $10$ cm radius when the sphere is charged to a potential difference of $300$ V is</p>
Question 51 :
The distance between the plate of a circular parallel plate condenser of diameter $40 mm$, in order to make its capacitance equal to that of a metallic sphere of radius $1m$, will be :
Question 53 :
A parallel plate capacitor has a uniform electric field $E$ in the space between the plates. If the distance between the plates is $d$ and area of each plate is $A$, the energy stored in the capacitor is :
Question 54 : <p class="wysiwyg-text-align-left"><span class="wysiwyg-font-size-small"><span class="wysiwyg-font-size-small">Two electric charges of $9\mu C$<i><span class="wysiwyg-font-size-medium"><span class="wysiwyg-font-size-medium"> </i><span class="wysiwyg-font-size-small"><span class="wysiwyg-font-size-small">and $-3\mu C$ <span class="wysiwyg-font-size-small"><span class="wysiwyg-font-size-small">are placed $0.16m$ apart in air. There will be a point P at which electric potential is $zero$ on the line joining the two charges and in between them. <span class="wysiwyg-font-size-small"><span class="wysiwyg-font-size-small">The distance of P from $9\mu C$ <span class="wysiwyg-font-size-small"><span class="wysiwyg-font-size-small">charge is:</p>
Question 55 :
Statement 1: The electrostatic force between the plates of a charged isolated capacitor decreases when dielectric fills whole space between plates.<br><br>Statement 2: The electric field between the plates of a charged isolated capacitance decreases when dielectric fills whole space between plates
Question 56 :
An electric dipole consists of two oppositecharges of magnitude 1$\mu \mathrm { C }$ separated by a distanceof 2$\mathrm { cm } .$ The dipole is placed in an electric filed$10 ^ { - 5 } \mathrm { Vm } ^ { - 1 }$ . The maximum torque does the field exerton the dipole is
Question 57 :
The plates of aparallel-plate capacitor are not exactly parallel. The surface charge density, therefore,
Question 59 :
Where should $q_3$ be placed to make the 'potential energy of the system equal to zero ?
Question 60 :
Seven capacitors, each of capacitance $2\mu F$ are to be connected to obtain a capacitance of $10/11\mu F$. Which of the following combinations is possible?
Question 61 :
Two metal spheres of radii a and b are connected by a thin wire. Their separation is very large compared to their dimensions. The capacitance of this system is :<br/>
Question 62 :
$A \ \ 6 \times 10^{-4}$ F parallel plate air capacitor is connected to a 500 V battery. When air is replaced by another dielectric material, $7.5 \times 10^{-4} C$ charge flows into the capacitor. The value of the dielectric constant of the material is:
Question 63 :
When dielectric medium of constant k is filled between the plates of a charged parallel-plate condenser, then the energy stored becomes, as compared to its previous value,
Question 64 :
A parallel plate capacitor is charged from a cell and then isolated from it. The separation between the plate is now increased.
Question 65 :
A variable air capacitor has $11$ movable plates and $12$ stationary plates, The area of each plate is $0.0015\ m^{2}$ and separation between opposite plates is $0.001\ m$. The maximum capacitance of the capacitor is
Question 66 :
If two electric charges $q$ and $-2q$ are placed at distance $6a$ apart, then locus of point in the plane of charges, where electric potential is zero is: (Take charge $q$ at origin and $-2q$ lies on positive x-axis)
Question 67 :
Two condensers of capacities $1\mu F$ are connected in series and the system is charged to $120$volts. Them the P.D. on $1\mu F$ capacitor (in volts) will be
Question 68 :
Two charges of magnitude 5 nC and -2 nC, one placed at points (2 cm, 0, 0) and (x cm, 0, 0) in a region of space, where there is no other external field. If the electrostatic potential energy of the system is -0.5 $\mu $J. The value of x is:
Question 69 :
If the dielectric constant and dielectric strength be denoted by $K$ and $X$ respectively, then a material, suitable for use as a dielectric in a capacitors, must have :<br>
Question 70 :
A battery is used to charge a parallel plate capacitor till the potential difference between the plates becomes equal to the electromotive force of the battery. The ratio of the energy stored in the capacitor and the work done by the battery will be :<br/>
Question 71 : <span class="wysiwyg-font-size-small"><span class="wysiwyg-font-size-small"><p class="wysiwyg-text-align-left">The distance between the plates of a condenser is reduced to $\frac{1}{4}th$ and the space between the plates is filled up by a medium of dielectric constant K(2.8). The capacity is increased by :<br/></p>
Question 72 :
A parallel plate capacitor with air as dielectric is charged to a potential 'V' using a battery. Removing the battery, the charged capacitor is then connected across an identical uncharged parallel plate capacitor filled with wax of dielectric constant 'K' the common potential of both the capacitor is 
Question 73 :
Assertion: Physically, if a dielectric with a high value of  k is placed in an electric field, the electric field will be greatly reduced inside.
Reason: Dielectrics are very useful in modern electronics as it is possible to to precisely control their permittivity by doping them with other types of materials.
Question 74 :
Assertion: If the distance between parallelplatesof a capacitor is halved and dielectricconstant isthree times, then the capacitancebecomes 6 times.<br>Reason : Capacity of the capacitor does not depend upon the nature of the material.
Question 75 :
Two condensers each of capacitance $2\mu F$ are connected in parallel and this combination is connected in series with a $12\mu F$ capacitor. The resultant capacity of the system will be:
Question 76 :
Two parallel plate air capacitors of same capacity $'C'$ are connected in series to a battery of emf $'E'$. Then one of the capacitors is completely filled with dielectric material of constant $'K'$. The change in the effective capacity of the series combination is
Question 77 :
Two capacitators having capacitances $\displaystyle { C }_{ 1 }$ and $\displaystyle { C }_{ 2 }$ are charged with $120\  V$ and $200\  V$ batteries respectively. When they are connected in parallel now, it is found that the potential on each one of them is zero. Then:
Question 78 :
If the plates of a capacitor are joined together by a conducting wire, then its capacitance :<br/>
Question 79 :
Two capacitors of capacitance C are connected in series. If one of them is filled with dielectric substance k, what is the effective capacitance?<br>
Question 80 :
A mega ohm resistor and an uncharged $1 \mu F$ capacitor are connected in  a single loop circuit with a constant sources of $4 $ volt.At one second after the connection is made what are the rates at which energy is being stored in the capacitor:
Question 81 : <p class="wysiwyg-text-align-left"><span class="wysiwyg-font-size-small"><span class="wysiwyg-font-size-small">Two electric charges <span class="wysiwyg-font-size-small"><span class="wysiwyg-font-size-small">$12\ \mu C$<i><span class="wysiwyg-font-size-medium"><span class="wysiwyg-font-size-medium"> </i><span class="wysiwyg-font-size-small"><span class="wysiwyg-font-size-small">and <span class="wysiwyg-font-size-small"><span class="wysiwyg-font-size-small">$-6\ \mu C$<i><span class="wysiwyg-font-size-medium"><span class="wysiwyg-font-size-medium"> </i><span class="wysiwyg-font-size-small"><span class="wysiwyg-font-size-small">are placed $20\ cm$ apart in air. There will be a point P, at which electric potential is zero on the line joining these two charges and outside excluding the region between them. The distance of P from $-6\ \mu C$ charge is:</p>
Question 82 :
Two parallel plates have equal and opposite charge. When the space between them is evacuated. the electric field between the plates $2 \times {10^5}\,V/m.$ When the space is filed with dielectric the electric field becomes ${10^5}\,V/m$ The dielectric constant of he dielectric material is 
Question 83 : <p class="wysiwyg-text-align-left"><span class="wysiwyg-font-size-small"><span class="wysiwyg-font-size-small">A capacitor acquires a potential difference<span class="wysiwyg-font-size-small"><span class="wysiwyg-font-size-small"> of $200\;V$ when $10^{12}$ electrons are taken from one plate and placed on the other plate. Its capacitance is:</p>
Question 84 :
Two ${ Cu }^{ 64 }$ nuclei touch each other. The electrostatics repulsive energy of the system will be
Question 85 :
A capacitor of capacity $0.1\ \mu$F connected in series to a resistor of $10\ $M$\Omega$ is charged to a certain potential and then made to discharge through resistor. The time in which the potential will  fall half of its original value is:<br/>(Given, $log_{10}2=0.3010$)<br/>
Question 86 : <span class="wysiwyg-font-size-small"><span class="wysiwyg-font-size-small"><p class="wysiwyg-text-align-left">Two metal plates are separated by a distance $d$ in a parallel plate condenser. A metal plate of thickness $t$ and of the same area is inserted between the condenser plates. The value of capacitance increases by a factor of : </p>
Question 87 :
Three charged particles are initially in position-1. They are free to move and they come to position -2, after some time.Let $ U_1$ and $ U_2$ be the electrostatic potential energies in position-1 and 2.Then
Question 88 :
A parallel plate air capacitor has a capacitance $C$.When it is half filled with a dielectric ofdielectric constant $5$, the percentage increase inthe capacitance will be :<br>
Question 89 :
The gap between the plates of a parallel plate capacitor of area $A$and distance between plates $d$, is filled with a dielectric whose permittivity varies linearly from $\epsilon_1$ at one plate to $\epsilon_2$ at the other. The capacitance of capacitor is :
Question 90 : <p class="wysiwyg-text-align-left">A 4$\mu F$ capacitor is charged to 400V and then the plates are joined through a 1000 ohm resistor. The heat produced in the resistor is :<br/></p>
Question 91 :
A capacitor of $50 \mu F$ is connected across a $200$ volt supply. The charge that it would take is
Question 92 :
Capacity of a capacitor is 48 $\mu F$. When it is charged from 0.1 C to 0.5 C, change in the energy stored is :<br/>
Question 93 :
n identical capacitors are connected in parallel to a potential difference V. These capacitors are then reconnected in series, their charges being left undisturbed. The potential difference obtained is :<br/>
Question 94 :
If the charge on a capacitor is increased by $4$C the energy stored in it increases by $44\%$. The original charge on the capacitor is?
Question 96 :
Two parallel plate air capacitors are constructed,one by a pair of iron plates and the second by a pair of copper plates of same area and same spacings. Then:
Question 97 :
A parallel plate capacitor is connected to a battery. The plate are pulled apart with a uniform speed. If $'x'$ is the separation between the plates, then the time rate of change of electrostatic energy of the capacitor is proportional to :<br>
Question 98 : <p class="wysiwyg-text-align-left"><span class="wysiwyg-font-size-small"><span class="wysiwyg-font-size-small">A charge $-2\ \mu C$<i> </i><span class="wysiwyg-font-size-small"><span class="wysiwyg-font-size-small">at the origin, $-1\ \mu C$ <span class="wysiwyg-font-size-small"><span class="wysiwyg-font-size-small">at $+7\ cm$<span class="wysiwyg-font-size-small"><span class="wysiwyg-font-size-small"> <span class="wysiwyg-font-size-small"><span class="wysiwyg-font-size-small">and $1\ \mu C$ <span class="wysiwyg-font-size-small"><span class="wysiwyg-font-size-small">at $-7\ cm$<i> </i><span class="wysiwyg-font-size-small"><span class="wysiwyg-font-size-small">are placed on the <i><span class="wysiwyg-font-size-medium"><span class="wysiwyg-font-size-medium">X-</i><span class="wysiwyg-font-size-small"><span class="wysiwyg-font-size-small">axis. The mutual potential energy of the system is:</p>
Question 99 :
A sheet of aluminium foil of negligible thickness is introduced between the plates of acapacitor. The capacitance of the capacitor
Question 100 :
Which of the following is not showing the essential difference between electrostatic shielding by a conducting shell and magnetostatic shielding?
Question 102 : <span class="wysiwyg-font-size-small"><span class="wysiwyg-font-size-small"><p class="wysiwyg-text-align-left">A parallel plate capacitor has area of each plate A, the separation between the plates is d. It is charged to a potential V and then disconnected from the battery. The amount of work done in filling the capacitor completely with a dielectric constant k is :<br/></p>
Question 103 :
A parallel plate capacitor without any dielectric within its plates, has a capacitance C, and is connected to a battery of emf V. The battery is disconnected and the plates of the capacitor are pulled apart until the separation between the plates is doubled. What is the work done by the agent pulling the plates apart, in this process?
Question 105 :
A$\displaystyle 40\mu F$capacitor in a defibrillator is charged to $3000 V$.The energy stored in the capacitor is setthrough the patient during a pulse of duration $2ms$, The power delivered to the patient is :
