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(A) For a given perimeter,the area of a circle is the maximum among all plane shapes. As the irregular loop changes into a circular loop,its area $A$

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current is induced in the loop in the anticlockwise direction

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(A) For a given perimeter,the area of a circle is the maximum among all plane shapes. As the irregular loop changes into a circular loop,its area $A$ increases.Since the magnetic field $B$ is uniform and directed into the plane,the magnetic flux $\phi = B \cdot A$ increases.According to Lenz's law,the induced current will create a magnetic field to oppose this increase in flux.Therefore,the induced magnetic field must be directed out of the plane.Using the right-hand thumb rule,a magnetic field directed out of the plane corresponds to an anticlockwise induced current.

There is a uniform magnetic field directed perpendicular and into the plane of the paper. An irregular shaped conducting loop is slowly changing into a circular loop in the plane of the paper. Then

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