In the figure (Figure 1) , both switches S1 and S2 are initially open. S1 is the

ID: 2165781 • Letter: I

Question

In the figure (Figure 1) , both switches S1 and S2 are initially open. S1 is then closed and left closed until a constant current is established. Then S2 is closed just as S1 is opened, taking the battery out of the circuit. Assume that R = 505.0 ohms and L = 305.0 mH .

Figure 1: http://session.masteringphysics.com/problemAsset/1264186/4/yg.21.50.jpg

A)What is the initial current in the resistor just after S2 is closed and S1 is opened? in A
B)What is the time constant of the circuit? in ms
C) What is the current in the resistor after a large number of time constants have elapsed? in A in A

Explanation / Answer

A)initial current in the resistor just after s2 is closed and s1 is opened =I=250/505=0.495A B)time constant=L/R=305x10^-3/505=6x10^-4 sec^-1 C)current=0A

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