In the circuit below, a parallel combination of a 10.0- ohm r esistor and a 7.0-

Question

In the circuit below, a parallel combination of a 10.0-ohm resistor and a 7.0-mH inductor is connected in series with an R = 5.5-ohm resistor, a 4.0-V dc battery, and a switch. After the switch has been closed for a very long time, it is opened.

In the circuit below, a parallel combination of a 10.0-ohm resistor and a 7.0-mH inductor is connected in series with an R = 5.5-ohm resistor, a 4.0-V dc battery, and a switch. After the switch has been closed for a very long time, it is opened. What is the voltage across the 5.5-ohm resistor immediately after the switch is opened? V What is the voltage across the 10.0-ohm resistor immediately after the switch is opened? V

Explanation / Answer

immediately after closing switch, inductor acts as a open circuit

V5.5= 5.5/(5.5+10.0)*4= 1.41935483871V

V10.0 = 2.58064516129 V

after a long time inductor acts as a short cicuit

V5.5 = Vsource = 4 V

V10.0 = 0V

current in inductor = current in R =

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