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JEE Advanced 2024 Paper 2

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Question : 4

Total: 51

A thin stiff insulated metal wire is bent into a circular loop with its two ends extending tangentially from the same point of the loop. The wire loop has mass m and radius r and it is in a uniform vertical magnetic field B0, as shown in the figure. Initially, it hangs vertically downwards, because of acceleration due to gravity g, on two conducting supports at P and Q. When a current I is passed through the loop, the loop turns about the line PQ by an angle θ given by

[JEE Adv 2024 P2]

tan‌θ=πrIB0∕(mg)
tan‌θ=2πrIB0∕(mg)
tan‌θ=πrIB0∕(2mg)
tan‌θ=mg∕(πrIB0)

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