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Q.

The magnetic flux in a coil is ϕ=(12t2+5t+1)mWb here t is in second .The emf induced in 5s is

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a

0

b

12.5V

c

0.15V

d

-0.125V

answer is D.

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Detailed Solution

e=-dϕdt e=-(24t+5)x10-3  e(5s)=-0.125V
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