At t =0s, the current in the circuit in the figure is I0. At what time is the current 12I0?

At t =0s, the current in the circuit in

## Answer

I(t) = I0 * e^(-t /T)

I(t) = I0 * e^(- t*R/L) = 0.5 * I0

e^(- t*R /L) = 0.5

t = L * ln2 /R

t = (75 * 10^-3 * ln(2)) / 300

t = 1.73 * 10^-4 sec