A d.c. generator is based on the principle of:

The north pole of a long bar magnet was pushed slowly into a short solenoid connected to a galvanometer. The magnet was held stationary for a few seconds with the north pole in the middle of the solenoid and then withdrawn rapidly. The maximum deflection of the galvanometer was observed when the magnet was:

An electric generator converts:

An induced current is produced when a magnet is moved into a coil. The magnitude of induced current does not depend on :

The frequency of direct current (d.c.) is: