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Finding the magnitude?

  1. Mar 14, 2015 #1
    1. The problem statement, all variables and given/known data
    Two 10-cm-diameter charged rings face each other, 25cm apart. The left ring is charged to -17nC and the right ring is charged to +17nC .
    A.What is the magnitude of the electric field E⃗ at the midpoint between the two rings?


    B.What is the magnitude of the force F⃗ on a -1.0 nC charge placed at the midpoint?
    Express your answer to two significant figures and include the appropriate units.

    2. Relevant equations
    (E1)z=ZQ1/4πε0(z^2+r^2)^(3/2)

    3. The attempt at a solution
    ((9E9)(.10)(-17E-9))/((.10)^2+(.50)^2)^3/2= 2.2E4.
    Unfortunately
    this is not the answer any help?
     
  2. jcsd
  3. Mar 14, 2015 #2

    haruspex

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    You don't seem to have correctly matched up the z and r variables in the equation to the given numbers. What values for z and r have you used?
     
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