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A circular coil having N turns and radius r carries a current I. It is held in the XZ plane in a magnetic field Bi . The torque on the coil due to the magnetic field is –

(I) Bπr2I/N

(2) Zero

(3) Bπr2I N

(4) Br2I/Πn

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Correct option  (3) Bπ2rIN


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