A small droplet of oil with mass of 242e-15 kilogram is, Ask an Expert

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A small droplet of oil with mass of 2.42e-15 kilogram is held suspended in a region of uniform electric field directed upward with a magnitude of 8725 N/C. Compute how many excess elementary charges reside on droplet? (The elementary charge is e = 1.60e^-19 C).

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