Question
Question: An aluminium ring B faces an electromagnet A. The current I through A can be altered <img src="http...
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 decrease, A will repel B
C
If I increase, A will attract B
D
If I increases, A will repel B
Answer
If I increases, A will repel B
Explanation
Solution
If current through A increases, crosses (X) linked with coil B increases, hence anticlockwise current induces in coil B. As shown in figure both the current produces repulsive effect.