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Homework Statement
Two otherwise identical, small conducting spheres have charges +6.0 µC and −2.0 µC. When placed a distance r apart, each experiences an attractive force of 9.1 N. The spheres are then touched together and moved back to a distance r apart. Find the magnitude of the new force on each sphere.
Homework Equations
Fe=kq1q2/r2
The Attempt at a Solution
The first thing I did was solve for r, r=√kq1q2/Fe=√8.98755×109×6×10-6×2×10-6/9.1N=0.1089meters
after the spheres come together there final charges will be +4μC and 0μC
I don't know where to go from here because when you plug a 0 charge into coulombs law you get 0 force.
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