Physics Help Forum Capacitors

 Feb 17th 2018, 08:06 AM #1 Junior Member   Join Date: Feb 2018 Posts: 2 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.
 Feb 17th 2018, 07:24 PM #2 Senior Member   Join Date: Apr 2017 Posts: 474 (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
Feb 17th 2018, 09:11 PM   #3
Physics Team

Join Date: Apr 2009
Location: Boston's North Shore
Posts: 1,576
 Originally Posted by waseefafridi 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.

 Feb 17th 2018, 09:59 PM #4 Junior Member   Join Date: Feb 2018 Posts: 2 Thank you so much! I was stuck in part b and now i got it thanks to you.
Feb 18th 2018, 02:05 AM   #5
Senior Member

Join Date: Apr 2017
Posts: 474
 Originally Posted by Pmb 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 .

 Tags capacitors

 Thread Tools Display Modes Linear Mode

 Similar Physics Forum Discussions Thread Thread Starter Forum Replies Last Post Efking Electricity and Magnetism 3 Feb 19th 2017 04:56 AM Samagra Thermodynamics and Fluid Mechanics 0 May 29th 2016 10:48 AM Clyner82 Advanced Electricity and Magnetism 0 Mar 28th 2016 09:05 AM binayakafle Electricity and Magnetism 18 Mar 1st 2010 07:30 AM nikhil Advanced Electricity and Magnetism 11 Jan 24th 2009 03:26 AM