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# 66. A small drop of water is suspended motionless in air by a uniform electric field...

66. A small drop of water is suspended motionless in air by a uniform electric field that is directed upward and has a magnitude of 8480 N/C. The mass of the water drop is 3.50 × 10-9 kg. (a) is the excess charge on the water drop positive or negative? Why? (b) How many excess elec- trons or protons reside on the drop?

here drop can be balanced by upward electrostatic force which balances the weight of the drop.

and number of electrons or protons we can get by using quantization of charge.

q= ne as solved below

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