For the circuit shown below, ε = 20 V, L = 4.0 mH, and R = 5.0 Ω. Afte

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For the circuit shown below, ε = 20 V, L = 4.0 mH, and R = 5.0 Ω. After steady state is reached with S1 closed and S2 open, S2 is closed and immediately thereafter (at t = 0) S1 is opened. Determine (a) the current through L at t = 0, (b) the current through L at t = 4.0×10−4 s, and (c) the voltages across L and R1 at t = 4.0×10−4 s. R1 = R2 = R.

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For the circuit shown below, $ε = 20 V, L = 4.0 mH$ , and $R = 5.0 Ω$ . After steady state is reached with $S_{1}$ closed and $S_{2}$ open, $S_{2}$ is closed and immediately thereafter (at $t = 0$ ) $S_{1}$ is opened. Determine (a) the current through $L$ at $t = 0$ , (b) the current through $L$ at $t = 4.0 \times 10^{- 4} s$ , and (c) the voltages across $L$ and $R_{1}$ at $t = 4.0 \times 10^{- 4}$ s. $R_{1} = R_{2} = R$ .