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Homework Help: Pointlike charge - electric potential

  1. Jan 22, 2015 #1
    This is my first time using a website like this, so I sincerely apologize if I'm posting in the wrong spot, I'm just in a bind/frustrated with this seemingly easy problem.
    1. The problem statement, all variables and given/known data
    What is the electric potential at a point 0.80 m away from a point charge of 3.5m C?

    2. Relevant equations
    Gauss' Law V= kQ1/R
    K = 9E9
    Q1 = 3.5 C
    R= .80m

    3. The attempt at a solution
    As far as I am aware, this is the only way to solve a problem like this and when using the equation given, I get an answer of 3.9375E10 V and LONCAPA (system in which homework is given) continues to say it is incorrect. I've tried converting it to nC as well and it won't work. Should there be another equation that I am missing in order to complete it or is it safe to suggest that system has the wrong answer as the correct one? thanks!
  2. jcsd
  3. Jan 22, 2015 #2


    User Avatar

    Staff: Mentor

    Hi Hannaps, Welcome to Physics Forums.

    The formula is correct. Your problem statement lists the electric charge as 3.5 mC. That's milli Coulombs. Try that.

    By the way, 3.5 Coulombs in one place would be a mighty big electric charge!
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