In an electric motor,the direction of current in the loop reverses after every $........$ rotation.

In an electric circuit,a fuse is used because $......$

$A$ magnet is moved towards a coil,an $emf$ and charge are induced in it. If the magnet is moved slowly,how will the new $emf$ and charge be affected?

How does the strength of the magnetic field at the centre of a circular coil of wire depend on: $(i)$ the radius of the coil $(ii)$ the number of turns of wire in the coil $(iii)$ the strength of the current flowing in the coil?

State the direction of the magnetic field in the following case:

Meena draws magnetic field lines of a field close to the axis of a current-carrying circular loop. As she moves away from the centre of the circular loop,she observes that the lines keep on diverging. How will you explain her observation?