P31_085 - 85. (a) As the switch closes at t = 0, the...

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85. (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 Ω and 10 Ω resistors. Hence, i = E 30 Ω =0 . 40 A which results in a voltage drop across the 10 Ω resistor equal to (0 . 40)(10) = 4 . 0 V. The inductor must have this same voltage across it |E L | , and we use (the absolute value of) Eq. 31-37:
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This note was uploaded on 11/12/2011 for the course PHYS 2001 taught by Professor Sprunger during the Fall '08 term at LSU.

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