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:

\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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