Q.

The coil of area 0.1 m2 has 500 turns. After placing the coil in a magnetic field of strength 4×10−4Wb/m2, if it is rotated through 900 in 0.1 s, the average emf induced in the coil is

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a

0.012 V

b

0.05 V

c

0.1 V

d

0.2 V

answer is D.

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Detailed Solution

e=−NBAcosθ2−cosθ1Δt=−500×4×10−4×0.1cos90∘−cos0∘0.1=0.2V
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The coil of area 0.1 m2 has 500 turns. After placing the coil in a magnetic field of strength 4×10−4Wb/m2, if it is rotated through 900 in 0.1 s, the average emf induced in the coil is