At $t=0,$ the current through a $67\mathrm{.}5$ mH inductor is $52\mathrm{.}5$ mA and is increasing at the rate of $72\mathrm{.}0m\frac{A}{s}.$

What is the initial energy stored in the inductor, and how long does it take for the energy to increase by a factor of $7\mathrm{.}0$ from the initial value?

Express your answer using three significant figures.

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Request Answer

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Part B

Express your answer using two significant figures.