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Question
A coil of area 10 cm2 has 200 turns. Magnetic field of 0.1 Wb/m2 is perpendicular to the plane of the coil. The field is reduced to zero in 0.1 s, the induced emf in the coil is
[1 Mark]
A coil of area 10 cm2 has 200 turns. Magnetic field of 0.1 Wb/m2 is perpendicular to the plane of the coil. The field is reduced to zero in 0.1 s, the induced emf in the coil is
[1 Mark]
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Solution
The correct option is B 0.2 V
The induced emf in the coil is
ε=−Ndϕdt=−Nd(BA)dt=−NA(dBdt)
ε=−200×(10×10−4)×0−0.10.1=0.2 V
The induced emf in the coil is
ε=−Ndϕdt=−Nd(BA)dt=−NA(dBdt)
ε=−200×(10×10−4)×0−0.10.1=0.2 V
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