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Q.

In a coil of area  10 cm2 and 10 turns with a magnetic field directed perpendicular to the plane and is changing at the rate of 108 gauss/second. The resistance of the coil is 20 ohm. The current in the coil will be 

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a

5 amp

b

0.5 amp

c

0.05 amp

d

5×108 amp 

answer is A.

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Detailed Solution

I=eR=−N(dϕ/dt)R=10×108×10−4×10−4×1020=5A

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