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Homework Help: Find force on charge.

  1. Nov 19, 2015 #1
    1. The problem statement, all variables and given/known data
    Find Force at 1uC charge
    https://i.gyazo.com/12891ce5b3adc422acc64daa6e8d3f25.png 12891ce5b3adc422acc64daa6e8d3f25.png

    2. Relevant equations

    3. The attempt at a solution
    Assume 1uC charge is at point P 2*10^-8C is at A and 10^-8C is at B
    FP = FPA + FPB

    FPA = K*2*0.01*1/100
    = 0.0002*K
    = 2k* 10 ^-4

    FPA = K*0.01*1/25
    = 0.00004*K
    = 4K x 10^-4

    Now adding them using vector addition,
    sqrt((4K*10^-4)^2 + (2K*10^-4)^2 + 0) --(cos(90) will be 0)

    Attached Files:

  2. jcsd
  3. Nov 20, 2015 #2


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    Science Advisor
    Homework Helper
    Gold Member

    Your handling of the powers of ten looks off (or you are using nonstandard units for force).
    What's 10-6x10-8?
    Later, what's (4k10-4)2?
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