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Posted by on Thursday, June 21, 2012 at 8:07pm.

Three fixed charges are located along a line. The - 2 C charge is 10cm to the left of the +5 C charge and the -4 C charge at 4 cm to the right of the +5 C charge.
a.what is the force exerted on the -4 C by the +5C charge?
b.what is the force exerted on the -4 C by the -2 C charge?
c.what is the net force exerted on the -4 C charge?

  • Physics - , Friday, June 22, 2012 at 2:24am

    let q1= -2C, q2= +5C, q3= -4C
    also r13=10+4=14cm=0.14m
    & r23= 4cm = 0.04m

    a) Force on q3 due to q2:
    F32= k*q3*q2/(r23)^2 towards left

    b)Force on q3 due to q1:
    F31= k*q3*q1/(r13)^2 towards right

    c) Net force on q3 = F32-F31

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