Posted by brittney on Wednesday, April 11, 2012 at 9:39pm.
The equilibrium position is between the two charges,there tha attractive forces to the +2.1nC and +4.7 nC charges are equal and opposite. If x is the distance from the 2.1 nC charge, require that
2.1/x^2 = 4.7/(57.9-x)^2
Solve that equation for x, which will be in centimeters. The -4.7 nC charge cancels out, as does the Coulomb constant, making the solution easy. You can use nC for charge and cm for distance on both sides of the equation.
(57.9-x)/x = sqrt(4.7/2.1) = 1.496
57.9/x = 2.496
x = ?
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