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A bead with a mass of 0.040 g and a charge of 10 nC is free to slide on a vertical rod. At the base of the rod is a fixed 20 nC charge.n equilibrium, at what height above the fixed charge does the bead rest?

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A bead with a mass of 0.040 g and a charge of 10 nC is free to slide on a vertical rod. At the base of the rod is a fixed 20 nC charge.n equilibrium, at

 

what height above the fixed charge does the bead rest?

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Equate the gravitational on the bead and ...

F F
:mg
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F F :mg

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