P23_037 - is its mass density. Thus, q = mg E = 4 r 3 g 3 E...

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37. When the drop is in equilibrium, the force of gravity is balanced by the force of the electric Feld: 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 Feld. 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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Unformatted text preview: is its mass density. Thus, q = mg E = 4 r 3 g 3 E = 4 (1 . 64 10 6 m) 3 (851 kg / m 3 )(9 . 8 m / s 2 ) 3(1 . 92 10 5 N / C) = 8 . 10 19 C and q/e = (8 . 10 19 C) / (1 . 60 10 19 C) = 5....
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