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conov3
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Homework Statement
An electron orbits a 3.0 cm diameter metal ball 5.0 mm above the surface. The orbital period of the electron is l2.0 micro seconds. What is the charge on the metal ball?
r=1.5cm or .015m
R=.02m (.015+.005)
Orbit=12*10^-6s
Homework Equations
E=(kq/r)R which gives electric field
k=9*10^9
Maybe F=qE?
Is this the only equation?
The Attempt at a Solution
(9*10^9*1.6*10^-19/.015)*.02 which gives E. not sure what to do next!
I fell like the time is involved with the problem.. but do not know where it takes part and cannot find another formula in my book.