The magnetic flux linked with coil, in weber, is given by the equation, \( \phi=5 t^{2}+3 t+16 \...

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The magnetic flux linked with coil, in weber, is given by the equation, \( \phi=5 t^{2}+3 t+16 \). The induced emf in the coil in the fourth second is
(A) \( 10 \mathrm{~V} \)
(B) \( 45 \mathrm{~V} \)
(C) \( 30 \mathrm{~V} \)
(D) \( 90 \mathrm{~V} \)
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