A coil of resistance $40 \mathrm{\Omega }$ is connected to a galvanometer of $160 \mathrm{\Omega }$ resistance. The coil has $6 \mathrm{mm}$ radius and $100$ turns. This coil is placed between the poles of a magnet such that magnetic field is perpendicular to the coil. If the coil is dragged out, then the charge through the galvanometer is $32$$\mathrm{\mu C}$. The magnetic field is

A short bar magnet passes at a steady speed right through a long solenoid. A galvanometer is connected across the solenoid. Which graph best represents the variation of the galvanometer deflection $\theta$ with time:-

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) : 

An electron beam is moving near to a conducting loop then the induced current in the loop :-