Hello students in this session we will study about electrical permittivity and Dielectric constant and also learn some important points about it. So lets start…
What is Electrical Permittivity ?
The medium surrounding the charged bodies affect the electric force. It is observed that the electric force between two point charges is maximum in free space. A medium always reduces this electric force.
👉The property of the medium which influences the electric force between the charges is known as the electrical permittivity (ϵ).
👉 The value of Electric permittivity of free space is 8.85 × 10-12 Nm2/C2.
Relative Electrical Permittivity or Dielectric Constant
Relative electrical permittivity or Dielectric constant of a medium is defined as the ratio of permittivity of the medium to the permittivity of free space or air.
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or
Hence Relative electrical permittivity of a medium is also defined as the electrostatic force (Fo ) between two charges in air to the force (F) between the same two charges kept in the medium at same distance.
👉Relative electrical permittivity or Dielectric constant has no units and no dimensions.
👉Relative electrical permittivity or Dielectric constant of Water is 80 approx.
Conclusion :
1) when we put a glass slab between two charges, it will decrease the electric force between them .
2) When we put a metallic slab between two charges, it will decrease the electric force to zero.
✅Sharpen Your Pencil ✍️
Q. 1 Two point charges in air at a distance of 20 cm. from each other interact with a certain force. At what distance from each other should these charges be placed in oil of relative permittivity 5 to obtain the same force of interaction –
(A) 8.94 × 10-2 m (B) 0.894 × 10-2 m
(C) 89.4 × 10-2 m (D) 8.94 × 102 m
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