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# A constant voltage of $25\; V$ 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 $t=0$?

$\begin {array} {1 1} (a)\;0\;V,25\;V & \quad(b)\;12.5\;V,12.5\;V \\ (c)\;10\;V,15\;V & \quad (d)\;25\;V,0\;V \end {array}$

(a) 0V,25V