Question

Question 1.19: A point charge of 2.0 μC is at the centre of a cubic Gaussian surface 9.0 cm on edge. What is the net electric flux through the surface?

Class 12 - Physics - Electric Charges And Fields Electric Charges And Fields Page-48

Answer 1

according to Gauss theorem,
electric flux is the ratio of charge inclosed into the Gaussian surface and permittivity of medium. e.g., $\bf{\phi=\frac{q}{\epsilon_0}}$

here, q is charge inclosed into the Gaussian surface.
given, q = 2 × 10^-6 C and
$\bf{\epsilon_0}$=8.85 × 10^-12 C²/Nm²

now, electric flux = 2 × 10^-6/8.85 × 10^-12
= 0.23 × 10^6 Nm²/C

hence, electric flux through the surface is 2.3 × 10^5 Nm²/C

Answer 2

Answer:

this is the required answer