I only need an answer for number 4. The answer for 2 (the first question) is 1.5

Question

I only need an answer for number 4.

The answer for 2 (the first question) is 1.54 and the answer for 3 (the second question) is 1.288.

An inductor and a resistor are connected with a double pole switch to a battery as shown in the figure. The switch has been in position b for a long period of time. 7.22 922 118 mH S b 0000 9.3 V If the switch is thrown from position b to position a (connecting the battery), how much time elapses before the current reaches 116 mA? Answer in units of ms. 003 (part 2 of 3) 10.0 points What is the maximum current in the inductor a long time after the switch is in position a? Answer in units of A. 004 (part 3 of 3) 10.0 points The switch has brushes within it so that the switch can be thrown from a to b without internal sparking. Now the switch is smoothly thrown from a to b, shorting the inductor and resistor How much time elapses before the current falls to 121 mA? Answer in units of ms.

Explanation / Answer

4 )

Io = current at t = 0   ,    = 1.288 A

I = current after time "t" = 0.121 A

T = time constant of the circuit = L/R = 0.118/7.22 = 0.016 sec

using the equation

I = Io e-t/T

0.121 = 1.288 e-t/0.016

t = 0.0378 sec = 37.8 ms

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