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Electric Field

  1. Sep 11, 2008 #1
    Three positive and equal charges Q1, Q2, and Q3 are at the corners of an equilateral triangle. Point P is at the midpoint of the line between Q1 and Q3 (the middle of the bottom of the equilateral triangle). The electric field at P is
    A.zero
    b. not zero and directed along the line from P to Q3
    c.not zero and is directed along the line from P to Q2
    d. not zero and is directed along the line from Q1 to Q2
    E.none of these are correct

    My thinking is that the answer is zero. I know that the electric field points away from positive charges so if Q1 and Q3 are at the bottom of the equilateral triangle the P is in the middle they are going to direct the opposite way and cancel each other out.

    Anybody know if this is correct or have a reason why another answer would be correct?
     
  2. jcsd
  3. Sep 12, 2008 #2

    alphysicist

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    Homework Helper

    Hi Kathi201,

    You're right that the electric field from Q1 and Q3 are going to cancel. But what about the field at P from Q2?
     
  4. Sep 12, 2008 #3
    Oh Ok thank you I forgot about Charge Q2. So the electric field at P is going to be directed along the line from P to Q2.

    Thanks for your help
     
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