JEE MAIN - Physics (2021 - 31st August Evening Shift - No. 14)
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
(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
(3) and (4) only
(2) and (4) only
(4) only
(1) and (3) only
Explanation
Since, $$\phi = \overrightarrow E \,.\,\overrightarrow A = EA\cos \theta $$
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$$\theta$$ = 90$$^\circ$$
$$\therefore$$ $$\phi$$ = 0
$$\theta$$ = 90$$^\circ$$
$$\therefore$$ $$\phi$$ = 0
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