Question

The dimension of εo _______

(a) [M^-1L^-3T^4I^2]

(b) [M^-1L^-3T^4I^4]

(c) [M^-1L^-3T^2I^2]

(d) [M^1L^-3T^4I^2]

The question was asked by my school principal while I was bunking the class.

My enquiry is from Coulomb’s Law in division Charges and Fields of Physics – Class 12

Answer 1

Correct option is (a) [M^-1L^-3T^4I^2]

Explanation: εo is the absolute permittivity of air medium and has value 8.854*10^-12C^2N^-1m^-2. Its dimension is [M^-1L^-3T^4I^2]. The permittivity of a medium is the product of this term with the dielectric constant or relative permittivity of that medium.