When current is 'switched on' and 'switched off' in a coil, a current is induced in another coil kept near it.

What is this phenomenon known as?

What is the function of brushes in an electric generator?

When a wire is moved up and down in a magnetic field, a current is induced in the wire. What is this phenomenon known as?

What is the major difference between the simple alternator and most practical alternators?

Why are Thermal Power Stations usually located near a river?