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 due to.

Options

A. `q_(2)`
B. only the positive charges
C. all the charges
D. `+q_(1)` and `-q_(1)`

Answer

C

Explanation

At any point over the spherical Gaussian surface, net electric field is the vector sum of electric field due to `+q_(1), -q_(1)` and `q_(2)`.
Don't confuse with the electric flux which is zero (net) passing over the Gaussian surface as the net charge enclosing the surface is zero.