Question

The flux entering and leaving a closed surface are 5times10^(5) and 4times10^(5) SI unit respectively then the net charge inside the surface will be ​

Answer 1

Answer:

Explanation:

Correct option is D

ε0​(ϕ2​−ϕ1​)We know that, electric flux ϕ1​ (or electric field lines) entering in a closed surface is -ve and electric flux ϕ2​ (or electric field lines) leaving a closed surface is +ve. Hence, net electric flux through the closed surface,                    ϕ=ϕ2​−ϕ1​Now, according to Gauss' theorem, the net electric flux ϕ passing through a closed surface is equal to the 1/ε0​ times of the total charge q, enclosed by surface i.e.                    ϕ=q/ε0​                    ϕ2​−ϕ1​=q/ε0​                     q=ε0​(ϕ2​−ϕ1​)