Electromagnetic Induction Part 2

Inductance of a coil with 104 turns is 10 mH and it is connected to a dc source of 10 V with internal resistance of 10Ω. The energy density in the inductor when the current reaches (‌

1

e

) of its maximum value is απ×‌

1

e2

J∕m3. The value of α is ____ .
(µ0=4π×10−7Tm∕A).