A small droplet of oil with mass of 349times10-16 kg is, Ask an Expert

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A small droplet of oil with mass of 3.49×10-16 kg is held suspended in a region of uniform electric field directed upward with a magnitude of 7125 N/C.

a) Is the excess charge on the droplet positive or negative?

b) How many excess elementary charges reside on the droplet? (The elementary charge is e = 1.60×10-19 C.)

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