85.(a) As the switch closes att= 0, the current being zero in the inductor serves as an initial conditionfor the building-up of current in the circuit. Thus, att= 0 any current through the battery is alsothat through the 20 Ω and 10 Ω resistors. Hence,i=E30 Ω=0.40 Awhich results in a voltage drop across the 10 Ω resistor equal to (0.40)(10) = 4.0 V. The inductormust have this same voltage across it|EL|, 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.