Question 1 :
In comparing e.m.f.s of 2 cells with the help of potentiometer, at the balance point, the current flowing through the wire is taken from:<br/>
Question 2 :
The internal resistance of a cell of emf $2$V is $0.1\pi$. If it is connected to a resistance of $3.9\pi$, then the voltage across the cell will be (in volts).
Question 3 :
A parallel plate capacitor is charged and then disconnected from the source of potential difference. If the plates of the condenser are then moved farther apart by the use of an insulated handle, which one of the following is true?<br/>
Question 4 :
In which of the following substances the resistance decreases with the increase in temperature?
Question 6 :
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 7 :
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 8 :
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 9 :
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 10 :
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 16 :
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 17 :
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 18 :
What would be the Q factor for a purely inductive circuit?
Question 19 :
The ratio between the primary voltage and the secondary voltage in a transformer is equal to:<br/>
Question 20 :
In a transformer, the number of turns of primary coil and secondary coil are $5$and$4$respectively. If$220 V$isapplied on the primary coil, then the ratioof primary current to the secondary current is
Question 24 :
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 25 :
What do we name the  device which increases the emf ?<br/>
Question 26 :
 A device used for measuring small currents due to changing magnetic field is known as:
Question 27 :
A large solenoid of windings of 400 turns per meter carries a current 5A. The magnetic field at the centre of the solenoid is about:
Question 28 :
A current of $10^{-7}$ ampere produces 50 division deflection in a galvanometer. Then its figure of merit will be<br>
Question 29 :
If a velocity has both perpendicular and parallel components while moving through a magnetic field, what is the path followed by a charged particle?
