The diagram shows a coil of wire wound on a soft iron core forming an electromagnet. A current is passed through a coil in the direction indicated by the arrow mark. The N and S pole produced in the iron core is

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B

as south and

A

as north pole

A

as south and

B

as north pole

Magnetic field will not be induced

None of the above

answer is B.

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Detailed Solution

When the current is passed through a coil of wire wound on a soft iron core, then A acts as South and B act as North.
From the diagram, it can be observed that the current starting from A is flowing in a clockwise direction which means that point A acts as the South pole. Since a unipolar magnet doesn’t exist, point B act as the North pole.

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