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Q.

A coil has 1,000 turns and 500 cm2  as its area.  The plane of the coil is placed at right angles to a magnetic induction field of 2×10−5 Wb/m2 . The coil is rotated through 1800  in 0.2 seconds. The average e.m.f induced in the coil, in milli-volts.

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a

5

b

10

c

15

d

20

answer is B.

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Detailed Solution

N=1000, A=500 cm2=500×10−4m2 B=2×10−5wb/m2 t=0.2 sCoil is rotated through 1800∴e=2BANt=2×2×10−5×5×10−2×1032×10−1         =10×10−3=10 mV
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