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Homework Help: Electric field

  1. Mar 25, 2013 #1
    1. The problem statement, all variables and given/known data

    a 030 kg ball is suspended in a uniform electric field as shown. If the charge on the ball is 500 x10^-4 C, what is the electric field strength?

    2. Relevant equations

    E= F/Q

    3. The attempt at a solution

    I did this by using the triangle method. draw the forces with a triangle(look at the attachment).
    My question is did i draw the triangle right? Does the direction of the Electric field affect my answer?

    Attached Files:

  2. jcsd
  3. Mar 25, 2013 #2
    Since the ball is in equilibrium, the forces on it must add to zero.
    Look at the direction of the tension force in your triangle.
  4. Mar 25, 2013 #3
    oh my, thank you so much ap123!

    I just got the tension force backwards, now it makes much more sense!!!! thank you !!
  5. Mar 25, 2013 #4
    Have you worked out the value for the electric field?
  6. Mar 25, 2013 #5
    yes i got 1.25 x10^3 N/C to the left
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