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1. Electric Charges and Fields
medium
Choose the incorrect statement :
$(a)$ The electric lines of force entering into a Gaussian surface provide negative flux.
$(b)$ A charge ' $q$ ' is placed at the centre of a cube. The flux through all the faces will be the same.
$(c)$ In a uniform electric field net flux through a closed Gaussian surface containing no net charge, is zero.
$(d)$ 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
A
$(c)$ and $(d)$ only
B
$(b)$ and $(d)$ only
C
$(d)$ only
D
$(a)$ and $(c)$ only
(JEE MAIN-2021)
Solution
Since $\phi=\vec{E} \cdot \vec{A}=E A \cos \theta$
$\theta=90^{\circ}$
$\therefore \phi=0$
Standard 12
Physics
