A soft iron bar is enclosed by a coil of insulated copper wire as shown in figure. When the plug of the key is closed, the face B of the iron bar marked as:

N-pole

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S-pole

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N-pole if current is large

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S-pole if current is small

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Solution

The correct option is A N-pole
For a solenoid,if we imagine gripping the solenoid with your right hand so that your curl fingers follow the direction of the current then your thumb will point towards the north end of the electromagnet.
So,as the current around the face B of the loop is in clockwise direction it develops north polarity.

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