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)

Current will decrease in each loop

Answer 2

When the two loops are brought together, the flux linking the two loops increases. By Lenz's law a current will be induced such that it opposes this change of flux . Therefore to oppose the increase in flux, the current in the two loops will decrease, so the flux decreases.