ch30-p101 - 101. (a) As the switch closes at t = 0, the...

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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 and 10 resistors. Hence, 0.400A 30.0 i ε == which results in a voltage drop across the 10 resistor equal to (0.400 A)(10 ) = 4.0 V. The inductor must have this same voltage across it | L |, and we use (the absolute value of)
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