二、RL电路的零状态响应 t=0 R LSu 已知:i1(0_)=0,求i(t),u2(t),t≥0二、RL电路的零状态响应 IS t = 0 L + _ R uL iR iL 已知：iL (0_ ) = 0，求 iL (t) , uL (t) , t  0