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Displacement Vector

Why is the co...

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Why is the constant 4pie multiplied to the permittivity of free space in the constant used in coulombs law?

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Q. Express dielectric constant in terms of permittivity of free space?

Q. What is permeability of free space? Why we are multiplying it?is it a constant?

e

is the electric charge of an electron,

c

is the speed of light in free space, and

h

is planck's constant,

ϵ_{0}

is permittivity of free space. The dimension of

\frac{e^{2}}{4 π ϵ_{0} h c}

Q. In a medium of dielectric constant

K

, the electric field is

\to E

ϵ_{0}

is permittivity of the free space, the electric displacement vector is :

Ratio of the permittivity of medium to the permittivity of free space is known as

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