time constant of RL circuit
tau = L/R
time constant of RC circuit
tau = RC
given that
L/R = RC
R^2 = L/C
R = sqrt (L/C)
R = sqrt (3.8/(3.8*10^-6)) = 1000 ohm = 1 k-ohm
2.
tau = L/R = 3.8/1000 = 3.8*10^-3 sec = 3.8 ms
OR
tau = RC = 3.8*10^-6*1000 = 3.8*10^-3 = 3.8 ms
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