AZINGLY SIMPLE! How to Calculate Electric Repulsion Force

[thomasrules]

Calculating charge and force of electric repulsion

Calculate the force of electric repulsion between two small spheres placed 1m apart if each has a deficit of 1x10^8 electrons.

I tried this and only got r=1m and N=1x10^8

I don't know the equation needed for this please help..

Thomas

 

[Andrew Mason]

Calculate the force of electric repulsion between two small spheres placed 1m apart if each has a deficit of 1x10^8 electrons.

I tried this and only got r=1m and N=1x10^8

I don't know the equation needed for this please help..

Do you know the charge (in Coulombs) of the electron? Just use that in the Coulomb force equation.

AM

 

[thomasrules]

so what would q be? Whats the charge on both spheres?

 

[Andrew Mason]

so what would q be? Whats the charge on both spheres?

If each has a deficit of 10^8 electrons, each has 10^8 more protons than electrons. So each has a charge of +10^8 e, where e = -1 x charge of one electron. The charge of one electron is -1.602 x 10^-19 C.

AM

 

[thomasrules]

so its (1.602x10^-19)(10^8)=charge?

 

[Andrew Mason]

so its (1.602x10^-19)(10^8)=charge?

Well, that is one of the charges. The other one is the same. Do you know how to apply Coulomb's law to find the force at a separation of one meter?

AM