i(0.1s) = i0e(-R/L)t = (ε/R)(e(-R/L)t) = (4.5/258)(e(-258/2.2)0.1) = 1.41 × 10-7 A
The current in the circuit at t = 0.1 s is 1.41 × 10-7 A
An RL circuit is shown on the right. L = 2.2 J, R = 258 Ω, ε = 4.5 V
Switch A is closed at t = 0.
After a long time, when the current reaches its steady value, open switch A and close switch B at the same time. Count this moment as t = 0.
Part (a) Calculate the numerical value of I at t = 0.1 s in amperes.
Part (b) Calculate the numerical value of I at t = L/R s in amperes.
Part (c) Calculate the current, in amperes, after an infinite time.
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