Physics Electromagnetism questions from NEET UG 2017.
A capacitor is charged by a battery. The battery is removed and another identical uncharged capacitor is connected in parallel. The total electrostatic energy of resulting system
An arrangement of three parallel straight wires placed perpendicular to plane of paper carrying same current $I$ along the same direction is shown in Figure. Magnitude of force per unit length on the middle wire $B$ is given by 
The diagrams below show regions of equipotential.  A positive charge is moved from $A$ to $B$ in each diagram.
A long solenoid of diameter $0.1m$ has $2\times {10}^{4}$ turns per meter. At the centre of the solenoid, a coil of $100$ turns and radius $0.01m$ is placed with its axis coinciding with the solenoid axis. The current in the solenoid reduces at a constant rate to $0A$ from $4A$ in $0.05s$. If the resistance of the coil is $10{\pi }^{2} \Omega ,$ the total charge flowing through the coil during this time is
Figure shows a circuit contains three identical resistors with resistance $R=9.0 \Omega$ each, two identical inductors with inductance $L=2.0\mathrm{mH}$ each, and an ideal battery with emf $\epsilon = 18 V$. The current $i$ through the battery just after the switch closed is: 
A potentiometer is an accurate and versatile device to make electrical measurements of E.M.F, because the method involves:
A $250$-Turn rectangular coil of length $2.1 cm$ and width $1.25 cm$ carries a current of $85 \mu A$ and subjected to a magnetic field of strength $0.85 T.$ Work done for rotating the coil by $180^{\circ}$ against the torque is:
In an electromagnetic wave in free space the root mean square value of the electric field is ${E}_{rms}=6V{m}^{-1}$. The peak value of the magnetic field is
The resistance of a wire is $R$ ohm. If it is melted and stretched to $n$ times its original length, its new resistance will be
Suppose the charge of a proton and an electron differ slightly. One of them is $e$, the other is $(e+\Delta e)$. If the net electrostatic force and gravitational force between two hydrogen atoms placed at a distance $d$ (much greater than atomic size) apart is zero, then $\Delta e$ is of the order of [Given mass of hydrogen ${m}_{h}= 1.67\times {10}^{–27} \mathrm{kg}$]