Saturday, 4 February 2017

short details on coulombs law

Statement: Coulomb's law states that the force of attraction or repulsion between two charges is directly proportional to the product of the charges and inversely proportional to the square of the distance between them and is along the line joining the charges.
Explanation:Suppose that two point charges,  and q2,
are at a distance 'r' apart in vacuum. If and  have the same sign, the two charges repel each other and if they have opposite signs,

they attract each other. The force exerted by either charge on the other is given by

In SI system, the constant of proportionality k is given by
permittivity of free space.
In a medium of permittivity

ε=ε0εr , εr :Relative permittivity of the medium .

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