101. (a) As the switch closes at t= 0, the current being zero in the inductor serves as an initial condition for the building-up of current in the circuit. Thus, at t= 0 any current through the battery is also that through the 20 Ωand 10 Ωresistors. Hence, 0.400A30.0iε==Ωwhich results in a voltage drop across the 10 Ωresistor equal to (0.400 A)(10 Ω) = 4.0 V. The inductor must have this same voltage across it |L|, and we use (the absolute value of)
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