Single correct option
The magnetic field inside a long current-carrying solenoid is
- A. uniform and parallel to its axis
- B. zero
- C. strongest near the ends and weak at the centre
- D. circular around the axis
Show answer and solution
Answer: (A) uniform and parallel to its axis
Inside an ideal long solenoid the field lines are parallel, equally spaced straight lines along the axis, so the field is uniform. Outside it is very weak, like that of a bar magnet. The circular field pattern belongs to a straight current-carrying wire. A soft-iron core makes the solenoid an electromagnet.
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