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Electric field intensity

  1. Jul 11, 2013 #1
    A +7.5 nC point charge and a -2.0 point charge are 3.0 cm apart. What is the electric field strength at the midpoint between the two charges?

    just give me the formula ?
     
  2. jcsd
  3. Jul 11, 2013 #2

    rude man

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    F = kq/r^2
    k = 9e9 SI
     
  4. Jul 11, 2013 #3
    whts is q ? and how do i find q from the question ?
     
  5. Jul 12, 2013 #4

    rude man

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    q is a point charge. Your problem gives two of them. r is the distance from q to the midpoint. Pay attention to the signs of each q.
     
  6. Jul 13, 2013 #5
    can you tell me the exact way to solve it ?
     
  7. Jul 13, 2013 #6

    rude man

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    We're not allowed to do that.

    Please reflect on what I said so far.
     
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