First slide

Force on a current carrying wire placed in a magnetic field

Question

Two identical coaxial circular loops carry current i each circulating in the clockwise direction. If the loops are approaching each other, then

Easy

A

Current in each loop increases
B

Current in each loop remains the same
C

Current in each loop decreases
D

Current in one-loop increases and in the other it decreases

Solution

According to Lenz's Law the induced current will be developed in such a way that it will try to oppose the further increase in the flux. So in the process of opposing the cause currents in both the loop will be decreasing.

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