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fball558
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capacitor discharge?
A 1.4 uF capacitor, initially uncharged, is connected in series with a 10 k ohms resistor and a 6 V battery of negligible internal resistance.
How long does it take the capacitor to reach 99% of its final charge?
this is part b. i already found out part a which asked What is the charge on the capacitor after a very long time?
answer to this part was 8.4 uC
for part b i think i will have to use the equation
Q=Qf(1-e^(-t/T)) where t is time and T is the time constant defined by T= RC
i plugged in arbatrary values just to define my 99% i picked 5 but that should not matter
5=4.95(1-e^(-t/(10000*1.4e-6)))
solve for t
this will be in seconds i assume and my answer wants it displayed in ms
i got an answer of around 32 ms but it says I am wrong.
any help would be great!
Homework Statement
A 1.4 uF capacitor, initially uncharged, is connected in series with a 10 k ohms resistor and a 6 V battery of negligible internal resistance.
How long does it take the capacitor to reach 99% of its final charge?
this is part b. i already found out part a which asked What is the charge on the capacitor after a very long time?
answer to this part was 8.4 uC
Homework Equations
for part b i think i will have to use the equation
Q=Qf(1-e^(-t/T)) where t is time and T is the time constant defined by T= RC
The Attempt at a Solution
i plugged in arbatrary values just to define my 99% i picked 5 but that should not matter
5=4.95(1-e^(-t/(10000*1.4e-6)))
solve for t
this will be in seconds i assume and my answer wants it displayed in ms
i got an answer of around 32 ms but it says I am wrong.
any help would be great!