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如图所示电路，P为纯电阻网络，L=0.1H，当U S (t)=10ε(t)V时，零状态响应i R (t)=(3-2e -100t )ε(t)A。如果把L换成C=0.05F的电容，激励源改为U S (t)=e -5t ε(t)V，求此时电路零状态响应i R (t)=?[ε(t)为阶跃函数]
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