Dielectric Constant Vacuum

Introduction to Dielectric Constant Vacuum

If we applied any electric field to the electrical insulator, it becomes dielectric material. If we place any dielectric material in the electric field, the electric charge does not flow through the dielectric as the charge flows through the conductor. But in this process some of the equilibrium is attained and this is called as dielectric polarization. In the process of polarization, the positive charges are shifted in the direction of applied field and the negative charges are shifted in the opposite direction of applied electric force. So that an internal electric field is set up inside the dielectric material, which can compensates the external or applied electric field.  William Whewell gave the name dielectric. Understanding Coulombs Constant is always challenging for me but thanks to all math help websites to help me out.

Dielectric Constant Vacuum

The name dielectric is used to explain the materials with the effect of polarization. After some time it is known as the dielectric constant. Generally, the dielectric material is used in between the plates of the capacitor. After insertion of the dielectric medium between the plates of the capacitor the capacitance of the capacitor increases. The dielectric constant has no unit because it the ratio of same type of quantities. I have recently faced lot of problem while learning Kinematics Formulas, But thank to online resources of math which helped me to learn myself easily on net.

Dielectric Constant in Terms of Force Relative to Vacuum

When the charges are situated in  a medium other than free space, the force between the charges is given by

Fm = q1q2  / 4`Pi` `epsi ` r^2                               ….(1)

Where, e is called the absolute permittivity of the intervening medium. The force between the same charges held at the same distance in the vacuum is given by

F0 = q1q2  / 4`Pi``epsi ` 0 r^2                              ….(2)

Where, `epsi ` 0 is the absolute permittivity of the free space

Dividing equation (2) by equation (1), we get

F0 / Fm = `epsi `   / `epsi ` 0 = `epsi ` r or K

Where, `epsi ` r or K is called the relative permittivity of the medium or dielectric constant of the medium. So, dielectric constant of a medium may be defines as the ratio of the force of attraction or repulsion between two point charges separated by a certain distance in vacuum or air to the force of attraction or repulsion between the same two point charges, held at the same distance in the medium. The dielectric constant for vacuum is 1 and dielectric constant for water is 81.