Posted by garvin on Saturday, February 9, 2013 at 5:33am.
three point charges of 3µC, 8µC and 5µC are located at the corners of an equilateral triangle. calculate the net force on the 8µC

physics  drwls, Saturday, February 9, 2013 at 8:44am
Vectorially add the two forces on the 8 uC corner due to the other corners. The 3 uC corner exerts a push
F1 = k*3*10^6*8*10^6/R^2
and the 5µC corner exerts a pull
F2 = k*3*10^6*5*10^6/R^2.
Ypu must specify R, the triangle side length, to get an answer.
k i the Coulomb constant.
F1 and F2 are 120 degrees apart. Define a coordinate system to explain directions.
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