Question

Which of the following correctly states Gauss law?

(a) Electric flux is equal to charge

(b) Electric flux per unit volume is equal to charge

(c) Electric field is equal to charge density

(d) Electric flux per unit volume is equal to volume charge density

The question was posed to me in semester exam.

This key question is from Electric Field Density topic in chapter Electrostatic Fields of Electromagnetic Theory

Answer 1

Correct option is (d) Electric flux per unit volume is equal to volume charge density

Explanation: The electric flux passing through any closed surface is equal to the total charge enclosed by that surface. In other words, electric flux per unit volume leaving a point (vanishing small volume), is equal to the volume charge density.