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25/10/2018

Coulomb Law


When two charged bodies place very close to each other, it experience a mechanical force.

According to Coulomb’s law

  • The force between charges bodies is directly proportional to product of charges, inversely proportional to square of distance between them and nature of medium surrounding them. 
  • Let Q1 and Q2 are two point charges, d is distant between them and F is force acts on two point charges.

        F α Q1Q2 / d2

        F = k Q1Q2 / d2

        Where k = Constant

                      = 1 /4πeoer

The value of constant k depends upon surrounding medium of charge.

Therefore F = Q1Q2 / 4πeoer d2

Where er = Relative permittivity of medium and

           eo = Absolute permittivity of the air

               = 8.854 × 10 – 12 Farad / meter

            F = Force, vector quantity

Let Q= Q2 = one coulomb, d = 1 meter, er = 1 and eo = 8.854 × 10 – 12

        F = Q1Q2 / ( 4 × 3.14 × 8.854 × 10 – 12 d) Newton

          = 9 × 109 Q1Q2 / dNewton

One coulomb charge

  • If Q= Q2 = Q , d = 1 meter , F = 9 × 109 Newton

        Then Q= Q2 = Q = ± 1 coulomb

  • One coulomb charge is defined as a charge which placed in air from an equal and opposite charge repels with a force of 9 × 109 Newton.

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