Need help with rl circuit problem determine the time


Need help with RL circuit problem.

Determine the time required for VR to reach 18 V on the rise curve.

I have time constant T = 2mH / 100kohms = 20ns

VR= v(1-e^-t/20

18 = 25(1-2.718( I'm not sure what do do at this point.

1201_RL circuit problem.jpg

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Physics: Need help with rl circuit problem determine the time
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