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Old Feb 17th 2018, 08:06 AM   #1
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Capacitors

A 1.0mF capacitor and a 2.0mF capacitor are connected in parallel across a 1200V supply line. (a) Find the charge and voltage across each (b) The charged capacitor is disconnected from the line and from each other, and reconnected the terminals of unlike sign together. Find the final charge on each and voltage across each.
Can anyone help me with this one? Thanks in advance!

Last edited by waseefafridi; Feb 17th 2018 at 10:15 AM.
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Old Feb 17th 2018, 07:24 PM   #2
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(a) Capacitors in parallel will have the same voltage ...
charge Q is in coulombs ...Q = C V

(b) ...when reverse connected some charge is lost .... subtract the smaller charge from the bigger charge ...what is left is shared between the two capacitors the voltage across the terminals will now be less but the same for each capacitor so you can find the answer just with Q = C V
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Old Feb 17th 2018, 09:11 PM   #3
Pmb
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Originally Posted by waseefafridi View Post
A 1.0mF capacitor and a 2.0mF capacitor are connected in parallel across a 1200V supply line. (a) Find the charge and voltage across each (b) The charged capacitor is disconnected from the line and from each other, and reconnected the terminals of unlike sign together. Find the final charge on each and voltage across each.
Can anyone help me with this one? Thanks in advance!
The rules of this forum require you to make an attempt at solving the problem before we can help. Oz ignores this rule for some reason.
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Old Feb 17th 2018, 09:59 PM   #4
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Thank you so much! I was stuck in part b and now i got it thanks to you.
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Old Feb 18th 2018, 02:05 AM   #5
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Originally Posted by Pmb View Post
The rules of this forum require you to make an attempt at solving the problem before we can help. Oz ignores this rule for some reason.
I didn't now about that rule ... I did take care not to do the callculation , it seems better to give some reply than just ignore a request for help .
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