1. Limited time only! Sign up for a free 30min personal tutor trial with Chegg Tutors
    Dismiss Notice
Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Homework Help: Equation Rearrangement

  1. Sep 1, 2010 #1
    1. The problem statement, all variables and given/known data
    so, the question is basically asking me to rearrange F = qE + qvB to find 'v'.

    3. The attempt at a solution
    I'm not the greatest at rearrangements, but here is my attempt.

    F - qvB = qE
    F - v = qE / qB (q values cancel each other out)
    v = (E / B) + F

    is this right, or have i gone wrong somewhere?

    Any help would be much appreciated :)
  2. jcsd
  3. Sep 1, 2010 #2


    User Avatar
    Homework Helper

    Let's make things simpler and write:


    you should understand this (we are making the term we want as the subject)

    Since we don't want the 'q' and 'B' to be by the 'v', what happens if we divide both sides by 'qB'?
  4. Sep 1, 2010 #3
    wouldn't you get:
    v = (F - E) / B ?
  5. Sep 2, 2010 #4


    User Avatar
    Homework Helper

    There no 'qB' by the 'F', so the 'F' becomes 'F/qB'.
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook