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A small drop of water is suspended motionless in air by a uniform electric field that is directed upward and has a magnitude of 8380 N/C. The mass of the water drop is 3.40 10-9 kg.

How many excess electrons or protons reside on the drop?

  • Physics - ,

    Enough (n) to make n*e*E equal to the drop's weight, M g

    Solve for n.

    e is the electron charge, E is the electric field strength, and you know what g is.

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