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

$\overline{){\mathbf{F}}{\mathbf{=}}\frac{\mathbf{k}{\mathbf{q}}_{\mathbf{1}}{\mathbf{q}}_{\mathbf{2}}}{{\mathbf{r}}^{\mathbf{2}}}}$, where **F** is the electric force, **k** is Coulomb's constant, **r** is the distance between the two charges, **q _{1 }**and

The weight of an object is expressed as:

$\overline{){\mathbf{W}}{\mathbf{=}}{\mathbf{m}}{\mathbf{g}}}$, 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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