First slide
Time -Varying current in L-R circuit
Question

In series with 20 Ω resistor, & 5 H inductor is placed. To the combination an e.m.f. of 5 V is applied. What will be the rate of increase of current at t = 0.25 s?

Moderate
Solution

i=i01-e-Rt/Ldidt=i0RLe-Rt/L=ELe-Rt/L

didt=55e-20×0.255=e-1

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