A capacitor with an initial potential difference of 126 V is discharged through

Question

A capacitor with an initial potential difference of 126 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 1.73 V. (a) What is the time constant of the circuit? (b) What is the potential difference across the capacitor at t = 15.1 s?

(a) Number Enter your answer for part (a) in accordance to the question statement Units Choose the answer for part (a) from the menu in accordance to the question statement

This answer has no units° (degrees)mkgsm/sm/s^2NJVWAkg·m/s or N·sN/m^2 or Pakg/m^3

Explanation / Answer

In a RC circuit Voltage as a function of time for discharging is given by

V=Voe-t/T

=>1.73=126e-10/T

-10/T=Ln(1.73/126)=-4.288

T=2.332 s

b)

at t=15.1 s

V=126e-15.1/2.332

V=0.1942 Volts

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