# Choose the correct option.

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

(1) is zero

(2) decreases as we move towards its ends

(3) increases as we move towards its ends

(4) is the same at all points

solution:
The magnetic field inside a long straight solenoid carrying current decreases as we move towards its ends. At the ends of solenoid, the strength of the magnetic field is almost the half that in the middle of the solenoid. Thus,

the correct option is (2).