Hey! Sign in to get help with your study questionsNew here? Join for free to post

Capacitance - Unit 4 Physics! Help Please.

Announcements Posted on
Four hours left to win £100 of Amazon vouchers!! Don't miss out! Take our short survey to enter 24-10-2016
    • Thread Starter

    Here is a link to the question: http://prntscr.com/amgop5
    I had a bit of trouble with this question, so what I deduced from increasing the charge by 50% is that the energy E must also increase in turn, as seen in this equation E = 1/2QV, so am I right in saying that the voltage V is constant and should remain unaffected by the increase of the charge? However I do not understand how the value of energy is is 2.25 E? The correct answer is C by the way. Thanks in advance!

    Sorry you've not had any responses about this. Are you sure you've posted in the right place? Here's a link to our subject forum which should help get you more responses if you post there.

    You can also find the Exam Thread list for A-levels here and GCSE here. :dumbells:

    Just quoting in Puddles the Monkey so she can move the thread if needed
    (Original post by Puddles the Monkey)

    Q = CV so p.d. is proportional to Q.
    If charge is increased by a half that is a factor of 1.5 that V will increase by
    E = ½ QV = ½ CV2 = ½ Q2/CE is proportional to Q2
    If charge is increased by a half that is a factor of 1.5 so energy will increase by 1.52 = 2.25
Write a reply…


Submit reply


Thanks for posting! You just need to create an account in order to submit the post
  1. this can't be left blank
    that username has been taken, please choose another Forgotten your password?
  2. this can't be left blank
    this email is already registered. Forgotten your password?
  3. this can't be left blank

    6 characters or longer with both numbers and letters is safer

  4. this can't be left empty
    your full birthday is required
  1. Oops, you need to agree to our Ts&Cs to register
  2. Slide to join now Processing…

Updated: April 2, 2016
TSR Support Team

We have a brilliant team of more than 60 Support Team members looking after discussions on The Student Room, helping to make it a fun, safe and useful place to hang out.

What do you wear to bed?

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

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