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A bead with a mass of 0.020 gg and a charge of 20 nCnC is free...

A bead with a mass of 0.020 gg and a charge of 20 nCnC is free to slide on a vertical rod. At the base of the rod is a fixed 15 nCnC charge.

In equilibrium, at what height above the fixed charge does the bead rest?

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