In $($Figure $1)$ switch $S_1$ is closed while switch $S_2$ is kept open. The inductance is $L=0\mathrm{.}270H,$ the resistance is $R=36\mathrm{.}0,$ and the emf of the battery is $30\mathrm{.}0$ V $.$ At time $t$ after $S_1$ is closed, the current in the circuit is increasing at a rate of $d\frac{i}{d}t=7\mathrm{.}20\frac{A}{s}.$

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Figure

$1$ of $1$

Part A

At this instant what is $V_{ab},$ the voltage across the resistor?

Express your answer with the appropriate units.

$V_{ab}=$

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