# Physics

A circuit with a capacitor took .128s to discharge from its max charge Qmax to half of that max charge once the battery was removed. In this series circuit there also is one resistor with 100 G(ohm symbol). The voltage drop is 12V across the battery.

What is the time constant of this circuit?

I know that time constant = RC but we are given two unknowns the time constant and the capacitance. R would be 100 x 10^9 or 1 x 10^11.

1. 👍 0
2. 👎 0
3. 👁 63
1. 1/2=e^(-t/rc)

Is this the problem statement?
Solve for c.

1. 👍 0
2. 👎 0

## Similar Questions

1. ### Physics

A circuit with a capacitor took .138s to discharge from its max charge Qmax to half of that max charge once the battery was removed. In this series circuit there also is one resistor with 100 G(ohm symbol). The voltage drop is 12V

asked by Andrea on April 4, 2008
2. ### physics

9-Volt battery is used to charge a 375 mF capacitor over a 147 Ù resistance. How many seconds will it take for the capacitor to reach 75% of its maximum charge? Hint: The equation below represents the charge of a charging

asked by crystal on March 10, 2011
3. ### Science

1. What is the direction of charge flow when charging a capacitor? When discharging a capacitor? What is your evidence? 2. Consider a circuit with a capacitor, battery, wire, and bulb. Describe the source(s) of charge during

asked by Ronnie on October 1, 2010

1. Given t1/2 to be 0.0137 seconds, how long should it take to reach 87.5% of maximum charge? 2. Let's say you measure t1/2 to be 0.0137 seconds and the resistance in the circuit is 99 Ohms. Then what is the capacitance in micro

asked by B on March 10, 2015
5. ### Physics

Consider the series RLC circuit in which R2

asked by rishabh gupta on May 5, 2013
6. ### physics urgent!

The magnetic field in the region shown below is increasing by 5 T/s. The circuit shown (with R=25 , C=55 µF, dimensions 1 m by 2 m) is inserted into the region as shown. The capacitor is initially uncharged. 1. What is the

asked by sonia on November 12, 2011
7. ### Physics

Consider the series RLC circuit in which R2

asked by rishabh gupta on May 1, 2013
8. ### physics

A 9 V battery is connected in series with a 100 Ω resistor and 12µF capacitor. The capacitor is initially uncharged. What is the capacitive time constant of the circuit? How much charge q(t) is in the capacitor after two time

asked by Anonymous on March 8, 2012
9. ### Physics

An RC-circuit has a time constant of 6x10-3 seconds. The capacitor stores a maximum energy of 8 J, when charged using a 3-Volt battery. Using the same battery, we want to increase tenfold the amount of stored energy, while keeping

asked by joe on April 27, 2010
10. ### SCience

An RC-circuit has a time constant of 6x10-3 seconds. The capacitor stores a maximum energy of 8 J, when charged using a 3-Volt battery. Using the same battery, we want to increase tenfold the amount of stored energy, while keeping

asked by Mike on March 10, 2010

More Similar Questions