Question

A wire of irregular shape turning into a circular shape in a magnetic field which is directed into the paper. The direction of induced current is

• A. along $abcda$
• B. along $adcba$
• C. into the plane of the paper
• D. out of the plane of the paper

Answer 1

Answer: (B)

When a wire of irregular shape turns into a circular loop, area of the loop tends to increase. Therefore, magnetic flux linked with the loop increases. According to Lenz’s law, the direction of induced current must oppose the magnetic flux, for which induced current should flow along $adcba$