# Calculate the rate of change of current in R1 at t = 0.?

Calculate the rate of change of current in R1 at t = 0.

### 1 Answer

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- oubaasLv 71 month ago
timeconstant T = L/R1 =2.5 msec

V= R1*i+L*di/dt @ t = 0, i = 0 , R1*i = 0 and Ldi/dt = V

di/dt = V/L = 20*10^3/40 = 5*10^2 A/sec

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