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Q.

A light disc made of aluminium (a nonmagnetic material) is kept horizontally and is free to rotate about its axis as shown in the figure. A point charge particle is revolving about the axis of disc, then the disc will

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a

Rotate in same direction as the direction of charge’s motion.

b

Not rotate but its temperature will remain unchanged

c

Not rotate but temperature will increase

d

Rotate in the direction opposite to the direction of charge’s motion

answer is B.

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Detailed Solution

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Due to eddy current disc rotates in the same direction.

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