Results are out! Find what you need...fast. Get quick advice or join the chat
x

Unlock these great extras with your FREE membership

  • One-on-one advice about results day and Clearing
  • Free access to our personal statement wizard
  • Customise TSR to suit how you want to use it

June 2010, physics 4 question 11

Announcements Posted on
Rate your uni — help us build a league table based on real student views 19-08-2015
  1. Offline

    ReputationRep:
    The question is about F=BILsin(theta). There is a wire with a current of 4A, length 0.05m, going through a magnetic field. This is on top of a balance and gives a reading of 0.8 'gram'. It then asks us to calculate the average flux density along the length of the wire.

    I went about this by saying that 0.8 grams is 0.8x10^-3 Kg. and that this represents a force of (0.8x10^-3)/9.8 N (using F=mg)

    I then substitue everything into F=BIL (It's at right angles) and get '4.08 x10^-4'.
    =>
    (0.8x10^-3 / 9.8) / (0.05 * 4)

    Looking at the markscheme, it just says that it is 0.04T. And i can't see why i am a factor of 100 out.

    Please help :/
  2. Offline

    ReputationRep:
    I worked it out in the end. Silly mistake on my part. I quoted F = mg and then in my calculations, and trust me i have no idea why, i did F = m/g. Durrr.

Reply

Submit reply

Register

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. By joining you agree to our Ts and Cs, privacy policy and site rules

  2. Slide to join now Processing…

Updated: May 20, 2012
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.

New on TSR

Rate your uni

Help build a new league table

Poll
How do you read?
Quick reply
Reputation gems: You get these gems as you gain rep from other members for making good contributions and giving helpful advice.