The inward annd outward electric flux from a closed surface are respectively `8xx10^(3) and 4xx10^(3)` units. Then the net charge inside the closed surface is

Options

A. `-(4xx10^(3))/(epsi_(0))`coulomb
B. `-4xx10^(3)epsi_(0)` coulomb
C. `4xx10^(3)` coulomb
D. `(4xx10^(3))/(epsi_(0))` coulomb

Answer

B

Explanation

Net flux`=4xx10^(-3)-8xx10^(-3)=-4xx10^(-3)`
According to Gauss's law, `phi=(q)/(epsi_(0)) " "therefore q=phiepsi_(0)`
`therefore q=-4xx10^(-3)epsi_(0)`coulomb