Homework Help: physics

Posted by jared on Tuesday, April 10, 2012 at 8:16pm.

A charge of 2.1 nC and a charge of 4.7 nC are separated by 57.90 cm. Find the equilibrium position for a -4.7 nC charge. _______________cm from the 2.1 nC charge.
i know you have to use coulomb's law but how can i use it

physics - Elena, Wednesday, April 11, 2012 at 1:17pm
F1 =F2
k•q1•|q3|/x^2 = k•q2•|q3|/(d-x)^2

where d-x = (0.579 - x ) m

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