Acapacitor with an initial potential difference of 185 v is discharged through a resistor when a switch between them is closed at t = 0 s. at t = 10.0 s, the potential difference across the capacitor is 1.64 v. (a) what is the time constant of the circuit? (b) what is the potential difference across the capacitor at t = 18.8 s?

Explanation:

The equation for the voltage V of  discharging capacitor in an RC circuit at time t is:

where is the initial voltage, and is the time constant.

For our problem, we know

and

So

This gives us

and this is the time constant.

At t = 18.8 s we got:

a displacement distance is size of displ

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