Charged capacitor connected to an uncharged capacitor

  • Thread starter Bolter
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  • #1
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Homework Statement:

Find the pd across the combined capacitors

Relevant Equations:

Q = CV
Hi there, tried doing this question but not sure if what I did for part b is right?

Screenshot 2020-05-12 at 22.51.17.png


IMG_4908.jpg


Appreciate any help! Thanks
 

Answers and Replies

  • #2
Merlin3189
Homework Helper
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Yes. Fine.

As it's so simple (the numbers), you might like to do an intuitive check and say something like,
The 4 μF is double the 2 μF, so its like you end up with 3 caps of 2 μF in parallel sharing the same charge.
So each cap has 1/3 of the total charge and so must be charged to 1/3 of the voltage that the single 2 μF needed.
 
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