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## Homework Statement

You see this trace on your oscilloscope for an RC circuit. The vertical scale is 5volt/square and the horizontal scale is 50ms/square. What is the time constant of the RC circuit?

## Homework Equations

Vc(t) = Vo(e^(-t/RC)

Vr(t) = -Vo * e^(-t/RC)

t halftime = Tln(2) = .69T

## The Attempt at a Solution

So when the voltage is at its peak (15 V), that's Vo. and if I take that as V(t), it's V at 20 ms (approximately). Substituting this:

15 V = 15V(e^(.02/RC))

1 = e^-.02/RC

ln(1) = -.02/RC

0 = -.02/RC

Cross multiplying to solve here doesn't help me. Is there another formula I can use?