Answer to Question #299876 in Electricity and Magnetism for Lhen

Question

The relative permittivity of a dielectric is 2.25

a) what is its permittivity?

b)What will be the capacitance if its dielectric is inserted into 7.8 uFair capacitor?

Answer 1

Answer

a) so permittivity of dielectric

$\epsilon=\epsilon_0 \epsilon_r\\=8.85\times10^{-12}\times2.25\\=19.91\times10^{-12}C^2/m^2.N$

b) capacitance become

$C'=2.25\times7.8\mu F\\=17.55\mu F$