A charged particle q is placed at the centre O of a cube of lenngth L (ABCDEFGH). Another charge q is placed at a distance L from O. then the electric flux emerging from q at O is

Options

A. `(q)/(3piepsi_(0)L)`
B. `(q)/(2piepsi_(0)L)`
C. `(q)/(epsi_(0))`
D. zero

Answer

C

Explanation

The charge enclosed by the cube =+q.
the charge +q kpt at a distance L from O is an external charge. Hence it does not contribute to the flux. Hence according to gauss's theorem, the electric flux emerging from q at O is given by `phi=(q)/(epsi_(0))`