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Question

A equilateral triangular loop of side l carries a current I. It is placed in a magnetic field B such that the plane of the loop is in the direction of B. The torque on the loop is

A
Zero
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B
IBl
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C
32IB2l2
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D
34IBl2
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Solution

The correct option is D 34IBl2
τ=NIAB=1×I×(34l2)B
=34IBl2

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