I don't really understand Coulombs Law

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SUMMARY

Coulomb's Law quantifies the electrostatic force between charged particles, specifically between a proton and an electron. The force exerted on a proton by an electron 15mm apart is calculated using the formula F = k * |q1 * q2| / r², where k = 9 * 10^9 N*m²/C², q1 = 1.602176487(40)×10−19 C (proton), and q2 = -1.602176487(40)×10−19 C (electron). The result indicates that the force is attractive due to the opposite charges of the proton and electron.

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1. How much Coulombs force is exerted on a proton by an electron if they are 15mm away from each other? Is the force attractive or repulsive?



2. http://www.glenbrook.k12.il.us/gbssci/phys/Class/estatics/u8l3b1.gif where k=9* 10^9 N*m^2/c^2



3. I know that the force is attractive,http://www.glenbrook.k12.il.us/gbssci/phys/Class/estatics/u8l3b2.gif but I don't know where to find some elements in Coulombs law.
 
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Electron
wikipedia said:
Electric charge: −1.602176487(40)×10−19 C
Proton
wikipedia said:
Electric charge: 1.602176487(40)×10−19 C
 

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