Exercise

The formula of the induced emf due to rate of change of magnetic flux passing through a coil will be

Radius of a circular loop placed in a perpendicular uniform magnetic field is increasing at a constant rate of $r_0{ \mathrm{ms}}^{-1}$. If at any instant radius of the loop is $r$, then emf induced in the loop at that instant will be

A magnet is taken towards a coil- [a] Rapidly [b] Slowly Then the induced emf is-

The north pole of a magnet is brought near a metallic ring as shown in fig. The direction of induced current in the ring will be-

Consider the situation shown in fig. If the switch is closed and after some time it is opened again, the closed loop will show

Two circular coils A and B are facing each other as shown in figure. The current i through A can be altered

When a magnet is moved with its north pole towards a coil placed in a closed circuit, then the nearest face of the coil-

A circular loop of flexible conducting material is kept in a magnetic field directed perpendicularly into its plane. By holding the loop at diametrically opposite points its is suddenly stretched outwards, then