Question

Figure alongside shows insulated copper coil connected to centre zero galvanometer. The galvanometer shows deflection to the right when the north pole of a powerful magnet is moved to the right. Answer the following question:

The magnetic polarity induced at the end is:

Options

• north

• south

• can not say certainly

• none of these

Answer 1

North

Explanation:

By Lenz’s law, the induced current opposes the motion of the magnet. Since a north pole is approaching end A, the induced polarity at end A must be north so that it repels the approaching north pole.