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Magnetic flux $\varphi$ (in weber) linked with a closed circuit of resistance 10 ohm varies with time $t$ (in seconds) as
$\phi=5 t^2-4 t+1$ The induced electromotive force in the circuit at $t=0.2 \mathrm{sec}$. is
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$\phi=5 t^2-4 t+1$ The induced electromotive force in the circuit at $t=0.2 \mathrm{sec}$. is
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The correct answer is:
$2.0$ volts
$e=-\frac{d \phi}{d t}=-(10 t-4)$ $\Rightarrow(e)_{t=2}=-(10 \times0.2-4)=2 \mathrm{volt}$
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