A small droplet of oil with mass of 481times10-15 kg is, Ask an Expert

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A small droplet of oil with mass of 4.81×10-15 kg is held suspended in a region of uniform electric field directed upward with a magnitude of 7025 N/C. How many excess elementary charges reside on the droplet? (The elementary charge is e = 1.60×10-19 C.)

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