An aluminium ring B faces an electromagnet A. If current I through A is altered then which of the following case is possible :

If i increase, A will repel B

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If i increase, A will attract B

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None of these

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whether i increase or decrease, B will not experience any force

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Solution

The correct option is A If i increase, A will repel B
A current is passed through solenoid A as shown. Current, entering at end A is clockwise. When seen from the side of A, so it develops south polarity at A and north polarity at B. When current I through A increases, it is like north of the magnet approaching the ring B and due to Lenz's law face of ring B facing B develops north polarity and hence there is repulsion between the two.

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