(a) If the switch is thrown to the left (connecting the battery), how much time

Question

(a) If the switch is thrown to the left (connecting the battery), how much time elapses before the current reaches 220 mA?
_________ ms
(b) What is the current in the inductor 10.0 s after the switch is closed?
________ A
(c) Now the switch is quickly thrown from a to b. How much time elapses before the current falls to 160 mA?
_________ ms

A 140 mH inductor and a 4.60 (a) If the switch is thrown to the left (connecting the battery), how much time elapses before the current reaches 220 mA? _________ ms (b) What is the current in the inductor 10.0 s after the switch is closed? ________ A (c) Now the switch is quickly thrown from a to b. How much time elapses before the current falls to 160 mA? _________ ms Omega resistor are connected with a switch to a 6.00 V battery as shown in Figure P32.27.

Explanation / Answer

Part A)

Apply I = E/R(1 - e-Rt/L)

.220 = (6/4.6)(1 - e-4.6t/.140)

t = 5.62 ms

Part B)

I = E/R(1 - e-Rt/L)

I = (6/4.6)(1 - e-4.6(10)/(.140)

I = 1.30 Amps

Part C)

I = E/R(e-Rt/L)

.160 = (6/4.6)(e-4.6t/.140)

t = 63.9 ms

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