question_answer 25)

          Choose the correct option. The magnetic field inside a long straight solenoid carrying current (a) is zero. (b) decreases as we move towards its end. (c) increases as we move towards its end. (d) is the same at all points. 

Answer:

The correct answer is (d) The magnetic field inside a current-carrying solenoid is constant in magnitude and direction, and acts along the axis of the solenoid.