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A small plastic sphere with a charge of -7.5 nC is near another small plastic sphere

with a charge of +11 nC. If the force between the spheres has a magnitude of 8.8×104

N, what is the distance between the spheres? What kind of force is this?

Verified Answer :

MissPhiladelphia

This force is called an electrostatic force. To solve for the value of the electrostatic force. Using Coulumbs Law: 

F = k abs (Q1 Q2) / r^2
where:
k = coulumb's constant, 8.988x10^9 N m^2/ C^2
Q1 = first charge
Q2 = second charge
r = distance between charges

8.8x10^4 = 8.988x10^9 abs((-7.5x10^-9) * (11x10^-9)) / r^2

solve for r

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