The magnetic energy stored in an inductor?

we bought and attempted the magnetic energy is here, what we found: question by Jason J : The magnetic power stored in an inductor A coil has an inductance of .80 H and resistance 41. The coil is connected to a five. V battery connected ideal. (A) When the existing reaches half its maximum value, at what rate is the magnetic energy stored in the inductor (B)? When the existing reaches half its maximum value, at what rate power is dissipated (C) When the existing reaches half its maximum

Tesla's Generator