A resistor with RR $=20\mathrm{.}0$ and an inductor with LL $=0\mathrm{.}600$ HH are connected in series to a battery that has emf $70\mathrm{.}0$ VV and negligible internal resistance. At time tt after the circuit is completed, the energy stored in the inductor is $0\mathrm{.}400$ JJ$.$

Part A

At this instant, what is the voltage across the inductor?

Express your answer with the appropriate units.