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oaghasey oaghasey
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12 years ago
Two identtical positive charges exert a repulive force of 6.4x10^-9 N when seperated by a distance of 3.8x10^10. Calculate the charge of each.


Please help, i dont understand the math part
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wrote...
12 years ago
The formula for the electric force between two charges is F = k*q1*q2 / r^2 (Coulomb's Law).

k is Coulomb's constant
q1 is the charge of the proton
q2 is the charge of the electron
r is the distance between the particles.
F is the electric force between the charges

You are given F, r and you know k.  You're told that both charges are identical, so q1=q2.

The formula becomes F = k*q^2 / r^2.  You need to rearrange the formula to solve for q.

From here, it's basic algebra.
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