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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.

Text Solution

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(a) 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. Accoridng to Lenz's law, the direction of induced current mus oppose the magnetic field, for which induced current should flow along adcba.
(b) In this case, the magnetic flux tends to decrease. Therefore , induced current must support the magnetic field, for which induced current should flow along adcba.
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