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

a
0
b
12.5V
c
0.15V
d
-0.125V

detailed solution

Correct option is D

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

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