Consider the charge configuration and a spherical Gaussian surface as shown in the figure. When calculating the flux of the electric field over the spherical surface, the electric field will be caused due to Option 1) $q_2$ Option 2) all the charges Option 3) only the +ve charges Option 4) $+q_1\: \: and \: \: -q_1$

Answers (1)

As we learnt in

Gauss's Law -

Total flux linked with a closed surface called Gaussian surface.

Formula:

$\dpi{100} \phi = \oint \vec{E}\cdot d\vec{s}=\frac{Q_{enc}}{\epsilon _{0}}$

- wherein

No need to be a real physical surface.

Qenc - charge enclosed by closed surface.

When we calculate flux we take only charges inside the Gaussian surface. But the electric field is caused by all the charges present.

Option 1)

$q_2$

This option is incorrect

Option 2)

all the charges

This option is correct

Option 3)

only the +ve charges

This option is incorrect

Option 4)

$+q_1\: \: and \: \: -q_1$

This option is incorrect

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