A student wants to make a bar magnet using a current-carrying solenoid. Which arrangement of the magnetic field lines will indicate that the solenoid is acting as a bar magnet?

Question

A student wants to make a bar magnet using a current-carrying solenoid. Which arrangement of the magnetic field lines will indicate that the solenoid is acting as a bar magnet? — Exam MCQ

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A. Field lines emerge from one end and enter the other, forming closed loops outside — The correct choice is Field lines emerge from one end and enter the other, forming closed loops outside. The result follows from the relevant magnetic-field, electromagnetic-induction or Fleming/right-hand-rule principle.

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B. Field lines spiral around the solenoid from end to end

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C. Field lines form straight parallel lines outside the solenoid only

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D. Field lines curve randomly inside the solenoid

A student wants to make a bar magnet using a current-carrying solenoid. Which arrangement of the magnetic field lines will indicate that the solenoid is acting as a bar magnet?

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