Question

Consider the three charges $+Q$ , $+2Q$ , and $-Q$ , and a mathematical spherical surface (it does not physically exist) as shown in the figure. What is the net electric flux on the spherical surface between the charges?

• A. $\frac{2Q}{{ϵ}_0}$
• B. $\frac{Q}{{ϵ}_0}$
• C. $0$
• D. $\frac{3Q}{{ϵ}_0}$

Answer 1

The correct option is B $\frac{Q}{{ϵ}_0}$

The electric flux through a closed surface is given by the total charge inside the surface divided by permittivity.

Here, only charge $+Q$ is inside.

Hence, flux is $\varphi =\frac{Q}{{ϵ}_o}$

Answer-(B)