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ZxcvbnM2000
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Homework Statement
A capacitor of capacitance 9 μF is fully charged from a 200 V dc supply. The
capacitor is now disconnected from the supply and connected in parallel with an
uncharged 3 μF capacitor. Once the 3 μF capacitor is fully charged, it is removed
and discharged. a) What charge remains on the 9 μF capacitor? b) How many
times would this process have to be repeated in order to reduce the charge on the 9
μF capacitor to below 50% of its initial charge? c) What would be the pd between
the plates of the 9 μF capacitor now be?
Homework Equations
Q=CV
The Attempt at a Solution
a) I said that the 3μF capacitor will be fully charged when the voltage across both capacitors is the same,let's say Vx.
Since energy has to be conserved then Ei=Ef therefore
C1V^2 = C1Vx^2 + C2Vx^2 <=> Q1' = 1.5588*10^-3 C . Am i doing this correct ?