A spherical oil droplet with a radius of 1.59 X 10^-7 m, a mass of 3.14 X10^-14 kg, and a charge magnitude of -1.602 X 10^-18 C on its surface is suspended in a downward-directed electric field. a) What is the magnitude of the external Electric Field (E) suspending the droplet? b) What is the oil droplet's surface charge density (σ) in coulombs per square meter? c) How many excess electrons does the charge on the oil droplet represent?

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Electric Charges and Fields

One of the fundamental properties is the electromagnetic property. Charge cannot be destroyed by any process and this contributes formally to the law of charge conservation.