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2 Problems involving electric field and work

  1. Nov 6, 2015 #1
    1. The problem statement, all variables and given/known data
    Excuse my excellent paint skills
    http://imgur.com/PbXdlOW
    If the work done by a charge from z to y is W. Would the work be different if it was from z to x then to y.
    2. Relevant equations
    W=vQ

    3. The attempt at a solution
    I said it would be the same because delta v would be the same in the end

    1. The problem state, all variables and give/known data
    http://imgur.com/RkG05ph

    What is the electric field at the point z and what is the direction
    2. Relevant equations
    E=kq/r^2
    3. The attempt at a solution
    I assume the positive and negative would cancel each other out. The distance between the charge and the center is d rad(2)/2 so the charge for one of them would be KQ/(2d^2/4)= 2KQ/d^2 then you just multiply that by 2 because there is two charges, but i don't know the direction
     

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  2. jcsd
  3. Nov 6, 2015 #2

    DrClaude

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    Staff: Mentor

    The fact that you don't know the direction in the last problem is an indication that you did something wrong. Can you justify
     
  4. Nov 7, 2015 #3
    My teacher showed us a problem where the opposite corners were opposite charges and he said the electric field at the middle is zero.
     
  5. Nov 7, 2015 #4

    DrClaude

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    Staff: Mentor

    What happens if you put a test charge in the middle?
     
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