Coulomb's Law

"When man wanted to make a machine that would walk he created the wheel, which does not resemble a leg"
Guillaume Apollinaire

F1 = F21 + F31 + F41 + ...

both are "inverse square" laws.  Substitute charge for mass and "k" for "G" and you have Coulomb's law.
exclamation The relative magnitudes of the Coulomb constant, k = 9 x 109 and the gravitational constant, G = 6.67 x 10-11, is an indication of the relative strengths of the two forces.  The electrical force of attraction is much, much stronger than the gravitational force of attraction.

"The wireless telegraph is not difficult to understand. The ordinary telegraph is like a very long cat. You pull the tail in New York, and it meows in Los Angeles. The wireless is the same, only without the cat."
Albert Einstein


Dr. C. L. Davis
Physics Department
University of Louisville