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Homework Help: Electric Potential & Electric Field

  1. May 1, 2014 #1
    1. The problem statement, all variables and given/known data

    Three positive charges lie on the x-axis; q1 = 15 μC is at the origin, q2 = -30 μC is at x = 2 m, and q3 = 15 μC is a x = 3 m. ( please also refer to the attachment.)
    Find the electric potential and electric field at point “P” aroused from q1, q2 and q3.

    3. The attempt at a solution

    The suggested answer is attached.
    But I don't understand why q1 is also counted in both answers, and why the corresponding distance(r) is 1.

    So weird to me.... please help!

    Attached Files:

  2. jcsd
  3. May 1, 2014 #2
    From the solution given , it seems that the point [itex]P[/itex] is at [itex]x=1[/itex] distance , that would make the eqns

    P.S Please write the solutions and/or any other equations in your post preferrably using LaTeX as it can be difficult to read equations from the image and/or quoting them.
  4. May 1, 2014 #3
    great! I understand now!! Sorry for the inconvenience. I will type them out next time. Thanks for your help :D
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