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The magnetic flux linked with a coil, in webers, is given by the equations $\phi=3 t^2+4 t+9$. Then the magnitude of induced e.m.f. at $t=2$ second will be
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$16$ volt
$e=-\frac{d \phi}{d t}=-\frac{d}{d t}\left(3 t^2+4 t+9\right)=-(6 t+4)$
$e=-[6(2)+4]=-16 \Rightarrow|e|=16 \mathrm{~volt}$
$e=-[6(2)+4]=-16 \Rightarrow|e|=16 \mathrm{~volt}$
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