ch22-p047 - 47 When the drop is in equilibrium the force of...

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47. When the drop is in equilibrium, the force of gravity is balanced by the force of the electric field: mg = qE , where m is the mass of the drop, q is the charge on the drop, and E is the magnitude of the electric field. The mass of the drop is given by m = (4 π /3) r 3 ρ , where r is its radius and
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