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A tiny sphere of mass m and charge +q is constrained to move vertically in a...

A tiny sphere of mass m and charge +q is constrained to move vertically in a small insulating cylinder, as shown. At the bottom of the cylinder is a point charge +Q. Give an expression for the height H above the bottom of the cylinder that the small sphere of mass m will be in equilibrium. Your expression must include q, Q, m, and physical constants.

Compute H if m = 2.0 mg (careful!), q = 40 pC, and Q = 80 pC.

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