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Q.

The magnetic flux inside a coil changes uniformly from 12×10-3wb to 24×10-3wb in 12ms.The induced emf in (volts) will be ________

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a

1

b

12

c

12×103

d

10

answer is B.

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Detailed Solution

Given that 12×10-3wb ϕ2=24×10-3wb ϕ=ϕ2-ϕ1

=12×10-3w

t=12ms=12×10-3w

e=dϕdt=12×10-312×10-3=1volt

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