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Q.

A metallic ring, having area 1 m2 and resistance 10 Ω is held in a uniform magnetic field of induction 2 μT with its plane perpendicular to the field. If the field is switched off in a time interval of 0.1 second, then the average current induced is

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a

2 μA

b

4 μA

c

0.5 μA

d

10 μA

answer is A.

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Detailed Solution

ε=Average induced emf =1×20.1μV=20 μV∴ Average current I=2010μA=2μA.
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