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A coil consisting of 200 turns of wire has its ends
connected to a circuit such that the total resistance of
the coil and the circuit is 2.0 ohm. There is no source of
e.m.f. in the circuit. Each turn of the coil is a square of
side 18 cm, and a uniform magnetic field directed
perpendicular to the plane of the coil is turned on. If the
field changes linearly from 0 to 0.5 T in 0.8 s, what is
the magnitude of the current in the coil while the field is
changing?
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Answer / mahesh
emf induced in the coil e=-(d$/dt)=-NA(dB/dt)
=200*(18/100)*(18/100)*((0.5-0)/(0.8))
=4.05 volts
induced current in the coil=induced emf/resistanc
=4.05/2=2.025 A
| Is This Answer Correct ? | 9 Yes | 1 No |
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