42. When the drop is in equilibrium, the force of gravity is balanced by the force of the electric field: mg= −qE, where mis the mass of the drop, qis the charge on the drop, and Eis the magnitude of the electric field. The mass of the drop is given by m= (4π/3)r3ρ, where ris its radius and
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This note was uploaded on 01/25/2011 for the course PHYSICS 17029 taught by Professor Rebello,nobels during the Fall '10 term at Kansas State University.