Question

Choose the correct option. The magnetic field inside a long straight solenoid carrying current
(i) is zero.
(ii) decreases as we move towards its ends.
(iii) increases as we move towards its ends.
(iv) is the same at all points.

Answer 1

The field lines inside the solenoid are in the form of parallel straight lines. This indicates that the magnetic field is the same at all points inside the solenoid. Thus, answer (iv) is correct.