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Homework Help: Point Charge

  1. May 5, 2009 #1
    1. The problem statement, all variables and given/known data
    Points A and B are 4.8cm and 7.2cm away from a point charge of -6.2[tex]\mu[/tex]C at point C. AC and CB are at right angles.

    a. How much work must be done in moving a 2.0x10^-12C charge from A to B
    b. what is the potential difference between points A and B?

    Ive been working at this problem with a friend for about a half hour. I have No idea what to do. Everything we tried failed.
  2. jcsd
  3. May 5, 2009 #2
    I would answer b) first.
  4. May 5, 2009 #3
    i tried that.. but maby iwas using the wrong equation. Which equation should i be using?
  5. May 5, 2009 #4
    The one which tells you the potential at distance r from a charge Q
  6. May 5, 2009 #5
    so V=kq/r. I tried this. It did not work.
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