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Work in Electric Fields

  1. Feb 5, 2010 #1
    1. The problem statement, all variables and given/known data

    What work is needed to move an electron from (0,5m,0) to (0,0,8m) in an electric field of E = {25, -30, 0} x 10^3 V/m?

    2. Relevant equations

    W = Change in U = Q* Change in V

    3. The attempt at a solution

    I calculated Change in V = -E* change in r. Change in r I got (0,-5, 8). Then I took that and multiplied it by the Electric Field and got 0-(30)(-5)-0 = 150 x 10^3.

    Now, how can I find charge Q? If I knew how to find charge Q I could multiply it to Change in V that I just calculated above and it would give me W.
     
  2. jcsd
  3. Feb 5, 2010 #2
    you have an electron .. so your chage Q should be the charge of electron which is 1.6x10^-19 c ..
     
  4. Feb 5, 2010 #3
    Ahh thanks...read the question too fast. Should have slowed down and payed attention.
     
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