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Q.

A coil has an area of 0.05 m2 and it has 800 turns. It is placed perpendicularly in a magnetic field of strength  4×10−5Wb/m2 it is rotated through 90∘ in 0.1 sec. The average e.m.f. induced in the coil is

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a

0.056 V

b

0.046 V

c

0.026 V

d

0.016 V

answer is D.

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Detailed Solution

e=−NBAcos⁡θ2−cos⁡θ1Δt=−800×4×10−5×0.05cos⁡90∘−cos⁡0∘0.1=0.016V
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