Name some sources of direct current.

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

Draw the magnetic field lines around a bar magnet.

List two methods of producing magnetic fields.

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

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.