K K Sharma Solutions for Chapter: Electromagnetic Induction, Exercise 8: Lenz's Law

A solenoid having an iron core has its terminals connected across an ideal DC source. If the iron core is removed, the current flowing through the solenoid 

A metallic ring with a small cut is held horizontally and a magnet is allowed to fall vertically through it. The acceleration of the magnet is,

$A$ to $B$ are two metallic rings, placed at opposite sides of an infinitely long straight conducting wire, as shown in the figure. If current in the wire is slowly decreased, the direction of induced current will be 

As shown in the figure, there is a permanent magnet and a current carrying coil. If the coil is moved towards the magnet then, current in the coil (magnet is symmetrical),

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 

Two identical circular coils, $A$ and $B$, are placed parallel to each other, with their centers on the same axis. The coil $B$ carries a current $I$ in the clockwise direction, as seen from $A$. What would be the direction of the induced current in coil $A$, as seen from $B$, when (i) the current in $B$ is increased (ii) the coil $B$ is moved towards $A$, keeping the current in $B$ constant.

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)