An RL circuit, with R = 300 and L = 1 H, has voltage v =

An RL circuit, with R = 300 Ω and L = 1 H, has voltage v = 100 cos (100t + 45°) (V) applied by closing a switch at t = 0. [A convenient notation has been used for the phase of v, which, strictly speaking, should be indicated as 100t + (π/4) (rad).] Obtain the resulting current for t > 0.