Maharashtra BoardEnglish MediumSTD 11 SciencePhysicsElectrostatics2 Marks
Question
What is relative permittivity?
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Answer
i. Relative permittivity or dielectric constant is the ratio of absolute permittivity of a medium to the permittivity of free space.
It is denoted as $K$ or $ε_r$.
i.e., $K$ or $\varepsilon_{ r }=\frac{\varepsilon}{\varepsilon_0}$
ii. It is the ratio of the force between two point charges placed a certain distance apart in free space or vacuum to the force between the same two point charges when placed at the same distance in the given medium.
i.e., $K$ or $\varepsilon_{ r }=\frac{F_{\text {varcuum }}}{F_{\text {medium }}}$
iii. It is also called as specific inductive capacity or dielectric constant.
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