From Coulomb's law, we get electric force from:
, where F is the electric force, k is Coulomb's constant, r is the distance between the two charges, q1 and q2 are the charges.
The weight of an object is expressed as:
, where m is the mass of an object and g is the acceleration due to gravity.
Two small plastic spheres each have a mass of 2.0 g and a charge of -50 nC. They are placed 2.0 cm apart (center to center).
a. What is the magnitude of the electric force on each sphere?
b. By what factor is the electric force on a sphere larger than its weight?
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