A coil has 2000 turns and area of 70 cm2. The magnetic field perpendicular to the plane of the coil is 0.3 Wb/m2 and takes 0.1 s to rotate through 1800. The value of the induced e.m.f. will be
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a
8.4 V
b
84 V
c
42 V
d
4.2 V
answer is B.
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Detailed Solution
e=−NBAcosθ2−cosθ1Δt=−2000×0.3×70×10−4cos180∘−cos0∘0.1⇒e=84 V