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Question

A square coil of edge l having n turns carries a current i. It is kept on a smooth horizontal plate. A uniform magnetic field B exists in a direction parallel to an edge. The total mass of the coil is m. Find Minimum value of B for which the coil will start tipping over ?

A
(mgnil)2
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B
2mgnil
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C
mg2nil
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D
mgnil
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Solution

The correct option is B mg2nil
Deflecting torque = niAB sin 90
=nil2B
Restoring torque =mgl2
For tipping nil2Bmgl2
Bmg2nil
Bmin=mg2nil
703853_639689_ans_e44da2fe5f774c24b9d481e2c3577202.png

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