Two co-axial solenoids are shown in the figure. If a key of solenoid $\mathrm{I}$ is suddenly opened, direction of instantaneous induced current in resistance $R$ which is connected to solenoid $\mathrm{II}$ is 

  

In the given figure, if the magnetic field, which is perpendicular to the plane of the paper, in the inward direction, increases, then 

Consider a metal ring kept on a horizontal plane. A bar magnet is held above the ring with its length along the axis of the ring. If the magnet is dropped freely, the acceleration of the falling magnet is ($g$ is acceleration due to gravity)

A time-varying voltage $V=2t \mathrm{volt}$ is applied across an ideal inductor of inductance $L=2 \mathrm{H}$, as shown in the figure. Select the incorrect statement.

Two different coils have self inductance $L_1=8 \mathrm{mH}$ and $L_2=2 \mathrm{mH}$, respectively. The current in one coil is increased at a constant rate and the current in the second coil is also increased at the same constant rate. At a certain instant of time, the power given to the two coils is same. At that time, the current, the induced voltage and the energy stored in the first coil are $i_1, V_1$ and $W_1$, respectively. The corresponding values for the second coil, at the same instant, are $i_2, V_2$ and $W_2$, respectively. Now, select the incorrect option.