Question

(i) Write down unit and dimension of permittivity of free space.

(ii) A Gaussian surface contains there charges (-q), (+ 2q) and (-q). Evaluate net electric flux through the surface.

Answer 1

(i) Unit of permitivity of free space = C² N^-3 m^-2(where C = columb. N-Newton, m=meter)

Dimenssion of pemitvity of free space = m^-1 L^-3 T⁴ A²

(ii) A ccording to question

Total charge = (q) + (+2q) + (-q)

∴ Total charge = 0

Electric flux through gaussian surface-