dtesselstrom
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Homework Statement
A 2.40 -mm-diameter glass sphere has a charge of + 1.70 nC.
What speed does an electron need to orbit the sphere 1.40 mm above the surface?
Homework Equations
Electric Field of Sphere: E=k*Q/(r^2)
q*E=M*v^2/r
The Attempt at a Solution
It seems pretty straight forward but I must be doing something wrong with the r values. Could someone tell me what the radius is considered. For the electric field is it the radius of sphere + the distance away or what and same for the other equation. I've tried pretty much all the combos I can think of and still am getting it wrong so not sure where I am going wrong.