Q.

A coil of area 100 cm2 has 500 turns. Magnetic field of 0.1 weber/metre2 is perpendicular to the coil. The field is reduced to zero in 0.1 second. The induced e.m.f. in the coil is

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answer is 2.

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Detailed Solution

e=−NB2−B1AcosθΔt=−500×(0−0.1)×100×10−4cos0∘0.1=5V
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A coil of area 100 cm2 has 500 turns. Magnetic field of 0.1 weber/metre2 is perpendicular to the coil. The field is reduced to zero in 0.1 second. The induced e.m.f. in the coil is