A $$250$$ $$-turn$$ rectangular coil of length $$2.1$$ cm and width $$1.25$$ cm carries a current of $$85$$ μA and subjected to a magnetic field of strength $$0.85$$ T. Work done for rotating the coil by $$180$$° against the torque is

Question

A $$250$$ $$-turn$$ rectangular coil of length $$2.1$$ cm and width $$1.25$$ cm carries a current of $$85$$ μA and subjected to a magnetic field of strength $$0.85$$ T. Work done for rotating the coil by $$180$$° against the torque is

Infinity Learn · Accepted Answer

Work done in a coil $$W=mBcos$$θ$$1-$$$$cos$$θ$$2When$$ it is rotated by angle $$180$$° $$thenW=2$$ m $$B=2(N$$ I $$A)$$ B             . . . .(i) Given: $$N=250$$,$$I=85$$μ$$A=85$$×$$10-6$$ $$AA=1.25$$×$$2.1$$×$$10-4$$ $$m2$$≈$$2.5$$×$$10-4$$ $$m2B=0.85$$ TPutting these values in eqn. (i), we get $$W=2$$×$$250$$×$$85$$×$$10-6$$×$$2.5$$×$$10-4$$×$$0.85$$≈$$9.1$$×$$10-6$$ $$J=9.1$$μJ

A 250 -turn rectangular coil of length 2.1 cm and width 1.25 cm carries a current of 85 $μ$ A and subjected to a magnetic field of strength 0.85 T. Work done for rotating the coil by 180° against the torque is

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A 250 -turn rectangular coil of length 2.1 cm and width 1.25 cm carries a current of 85 μA and subjected to a magnetic field of strength 0.85 T. Work done for rotating the coil by 180° against the torque is

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A 250 -turn rectangular coil of length 2.1 cm and width 1.25 cm carries a current of 85 $μ$ A and subjected to a magnetic field of strength 0.85 T. Work done for rotating the coil by 180° against the torque is