Three identical resistors are connected to a battery, an inductor, and a switch as shown in the figure. (The values of all circuit elements are given below the figure.) The switch has been open for a very long time, and then it is closed at time t = 0.
Immediately after the switch is closed, the voltage VL across the inductor is
(a) VL = 0 V
(b) VL = 6 V Correct
(c) Neither of the above answers is correct.
After the switch has been closed for a very long time, how much energy EL is stored in the inductor?
(a) EL = 3.30 × 10-6 J Correct
(b) EL = 5.62 × 10-6 J
(c) EL = 8.63 × 10-6 J
(d) EL = 1.07 × 10-5 J
(e) EL = 1.12 × 10-5 J
After the switch has been closed for a very long time, a steady current has been established through the inductor. The switch is then reopened. What fraction of this current, fI, remains after a time interval of Δt = 3 μsec has elapsed?
(a) fI = 0.0521
(b) fI = 0.0926
(c) fI = 0.158
(d) fI = 0.201
(e) fI = 0.236 Correct
The Attempt at a Solution
can i just say regardless of any situation, VL is equal to Vbattery immdiately after switch is closed?
I can't find the current across L. in this case.
I am not sure how to start with this question.