Choose the correct option.
The magnetic field inside a long straight solenoid carrying current

Consider a circular loop of wire lying in the plane of the table. Let the current pass through the loop clockwise. Apply the right-hand rule to find out the direction of the magnetic field inside and outside the loop.

When does an electric short circuit occur?

Explain the underlying principle and working of an electric generator by drawing a labelled diagram. What is the function of brushes?

What is the function of an earth wire? Why is it necessary to earth metallic appliances?

Draw the magnetic field lines around a bar magnet.