Question

Two circular, similar, coaxial loops carry equal currents in the same direction. If the loops are brought nearer, what will happen?

• A. Current will increase in each loop
• B. Current will decrease in each loop
• C. Current will remain same in each loop
• D. Current will increase in one and decrease in the other

Answer 1

Answer: (B)

When the loops are brought nearer, magnetic flux linked with each loop increases. Thus, the current will be induced in each loop in a direction opposite to its own current in order to oppose increase in magnetic flux. This is in accordance with Lenz's law. So, the current will decrease in each loop.