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Electric Force

1. Homework Statement
Two identical conducting small spheres are placed with their centers 0.300m apart. One is given a charge of 12.0 nC and the other a charge of -18.0 nC. a) Find the electric force exerted by one sphere on the other. b) Next, the spheres are connected by a conducting wire. Find the electric force between the two after they have come to equilibrium.


2. Homework Equations
F_e = (k_e)*(q1*q2)/(r^2)


3. The Attempt at a Solution
k_e is a constant of 8.99e9 N*m^2/C^2
plug the rest but I just don't understand the signs that well. Also when do i use the directional equation.
 

Answers and Replies

85
0
For the signs, I suggest you think about what direction forces have depending on their charges instead of trying to to plug them into the equation.
 

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