How was coulombs law derived? What does it show?

Coulomb’s law, derived experimentally in 1785, gives the electrostatic force between two charges.

Diagram and equation for Coulomb's law?

Description of Coulomb's law equation?

The permittivity of free space?

The elementary charge?

1.60217733´10^{-19} C

The Scalers and vectors present in Coulomb's law?

F_{12} & r_{21} are vectors.

They have magnitude and direction.

r_{21} is a unit vector, unit magnitude

(The Hat means magnitude)

**Note: F _{12} = -F_{21}**

In coulombs law the Force and charge are related......

Related by the inverse square.

What happens when many forces are present

With many charges present (distribution) then the resultant forces must be added vectorially. The resultant force, F0 is:

The equation for Superposition of charges via coulombs law?

Finding the force exerted on a charge Q_{0} on the axis of a charged ring of radius R.

The equation for an elemental charge:

Finding the force exerted on a charge Q0 on the axis of a charged ring of radius R.

The force that this elemental charge exerts on Q_{0} is