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Question
A flexible metallic loop abcd in the shape of a square is kept in a magnetic field with its plane perpendicular to the field. The magnetic field is directed into the paper normally. Find the direction of the induced current when the square loop is crushed into an irregular shape as shown in the figure.
Solution
When the square loop is crushed into an irregular shape, the area enclosed by the loop decreases, reducing the magnetic flux through the loop. According to Lenz's Law, the induced current flows in a direction to oppose this decrease in flux. To maintain the flux directed into the paper, the induced current flows clockwise in the loop.
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