An aluminium ring B faces an electromagnet A.The current I through A can be altered

Question

An aluminium ring B faces an electromagnet A.The current I through A can be altered (A) Whether I increases or decreases B will not experience any force (B) If I decreases, A will repel B (C) If I increases, A will attract B (D) If I increase, A will repel B.

Tardigrade Admin · Accepted Answer

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.

Q. An aluminium ring B faces an electromagnet A.The current I through A can be altered

Whether I increases or decreases B will not experience any force

If I decreases, A will repel B

If I increases, A will attract B

If I increase, A will repel B.