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The magnetic flux associated with a closed loop is ϕ = 6t^2 + 7t + 1, where ϕ is in milliweber and t in seconds.

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The magnetic flux associated with a closed loop is ϕ  = 6t2 + 7t + 1, where ϕ  is in milliweber and t in seconds. What will be the value of induced emf after 2 second ? 

(a) 29 mV 

(b) 60 mV 

(c) 31 mV 

(d) 22 mV

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Correct option (c) 31 mV

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