Question

(a) Draw the magnetic lines of force due to a circular wire carrying current.
(b) What are the various ways in which the strength of magnetic field produced by a current-carrying circular coil can be increased?

Answer 1

(a)
When current passes through a circular wire, magnetic field is produced around it. The magnetic field lines are circular near the wire. At the centre, these lines are straight.


(b) Ways to increase the strength of magnetic field produced by a current-carrying circular coil:
1. By increasing the current passing through the coil
2. By decreasing the radius of the coil
3. By increasing the number of turns of wire in the coil