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What is the magnitude/direction of the E field?

  1. Nov 5, 2016 #1
    1. The problem statement, all variables and given/known data
    A bob of mass 0.005kg is attached to a pendulum and has a charge of -8.0 uC. The pendulum is 1.0m long and has a periods of 1.2 s when it's puts it in a vertical uniform electric field E. What are the magnitude and direction of E?

    2. Relevant equations
    ∑Fy = qE - mg = ma

    q is charge
    E is electric field
    m is mass
    g is gravity
    a is acceleration
    L is length
    T is period

    3. The attempt at a solution
    I set up a FBD and this is what I have so far.
     
  2. jcsd
  3. Nov 5, 2016 #2
    At this point I'm trying to find an equation for acceleration so I can solve for E.
     
  4. Nov 5, 2016 #3

    gneill

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    Staff: Mentor

    Show what you've done.
     
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