Turn on thread page Beta
    • Thread Starter

    Hi. This capacitance problem's gotten me confused. Please help!
    A capacitor A of capacitance 4 microfarads is charged to a p.d of 20 V. An uncharged capacitor B of capacitance 2 microfarads is then connected in parallel with A. What is the (a) the energy initially stored in A (b) The pd acros A after B has been connected (c) the energy finally stored in A and B

    I got .8 mJ for the first one but for part B, I had 20 V but it's supposed to be 14 ..i tried to figure how they got that with the ratio but i'm confused..isn't the voltage across parallel capacitors supposed to be the same?

    Thanks 2 ne1 who replies to this post!
Submit reply
Turn on thread page Beta
Updated: April 13, 2011
The home of Results and Clearing


people online now


students helped last year

University open days

  1. Sheffield Hallam University
    City Campus Undergraduate
    Tue, 21 Aug '18
  2. Bournemouth University
    Clearing Open Day Undergraduate
    Wed, 22 Aug '18
  3. University of Buckingham
    Postgraduate Open Evening Postgraduate
    Thu, 23 Aug '18
How are you feeling about GCSE results day?

The Student Room, Get Revising and Marked by Teachers are trading names of The Student Room Group Ltd.

Register Number: 04666380 (England and Wales), VAT No. 806 8067 22 Registered Office: International House, Queens Road, Brighton, BN1 3XE

Write a reply...
Reputation gems: You get these gems as you gain rep from other members for making good contributions and giving helpful advice.