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A constant voltage of $25 \mathrm{~V}$ is applied to a series $L-R$ circuit at $t=0$, by closing a switch. What is the potential difference across the resistor and the inductor at time $t=0$ ?
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The correct answer is:
$0 \mathrm{~V}, 25 \mathrm{~V}$
At, $t=0$, switch closes
Current $i=i_0\left[1-e^{-t R / L}\right]$
So, at $t=0, i=0$
So, potential across inductor $=25 \mathrm{~V}$ and across resistor $=0 \mathrm{~V}$
Current $i=i_0\left[1-e^{-t R / L}\right]$
So, at $t=0, i=0$
So, potential across inductor $=25 \mathrm{~V}$ and across resistor $=0 \mathrm{~V}$
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