Electric Flux & Gauss's Law
Choose the incorrect statement:
(1) The electric lines of force entering into a Gaussian surface provide negative flux. (2) A charge 'q' is placed at the centre of a cube. The flux through all the faces will be the same. (3) In a uniform electric field net flux through a closed Gaussian surface containing no net charge, is zero.
(4) When electric field is parallel to a Gaussian surface, it provides a finite non-zero flux. Choose the most appropriate answer from the options given below
Show answer and solution
Answer: (c)
- (1) Correct: lines entering a closed surface give negative flux.
- (2) Correct: by symmetry each face gets .
- (3) Correct: with no net charge enclosed, the net flux is zero.
- (4) Incorrect: if is parallel to the surface, , so the flux is zero.
- So the answer is (c) (4) only.