Coulomb's Law (Electric Force) Video Lessons

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Problem: 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?

FREE Expert Solution

From Coulomb's law, we get electric force from:

F=kq1q2r2, where F is the electric force, k is Coulomb's constant, r is the distance between the two charges, qand q2 are the charges. 

The weight of an object is expressed as:

W=mg, where m is the mass of an object and is the acceleration due to gravity. 

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Problem Details

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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