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Use Lenz's law to determine the directio...

Use Lenz's law to determine the direction of induced current in the situation described by Fig.
(a) a wire irregular shape turning into a circular shape (b) a circular loop being deformed into a narrow straight wire. The across indicate the magnetic field into the paper and the dots indicate magnetic field out of the paper.

A

along abcda

B

along adcba

C

into the plane of the paper

D

out of the plane of the paper

Text Solution

Verified by Experts

The correct Answer is:
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. Accrording to Lenz's law, the direction of induced current must oppose the magnetic flux, for which induced currect should flow along adcba.
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