An inductor-coil of inductance 20 mH having resistance `10 Omega` is joined to an ideal battery of emf 5.0 V. Find the rate of change of the induced emf at t=0, (b) t = 10 ms and (c ) t = 1.0s.

Answer

A, B, C

Explanation

`epsilon=L(dl)/(dt)=epsilon_(v)e^(-Rt//L) rArr (depsilon)/(dt)=-epsilon_(0)R//L e^(-Rt//L)`