Question

A point charge $4\mu C$ is at the centre of a cubic Gaussian surface $10cm$ on edge. Net electric flux through the surface is

• A. $2.5\times {10}^{5}N{m}^2{C}^{-1}$
• B. $4.5\times {10}^{11}N{m}^2{C}^{-1}$
• C. $4.5\times {10}^{6}N{m}^2{C}^{-1}$
• D. $2.5\times {10}^{6}N{m}^2{C}^{-1}$

Answer 1

The correct option is B $4.5\times {10}^{11}N{m}^2{C}^{-1}$

A point charge $=4\mu C$

Centre of a cubic Gaussian surface $=10cm$

Net electric flux through the surface $E=\frac{q}{{\in }_0}$

$=\frac{4}{8.854\times {10}^{-12}}=4.5\times {10}^{11}N{m}^2{C}^{-1}$