Question

A point charge + q is placed at the centre of a cube of side $l$. The electric flux emerging from the cube is

• A. $\frac{ 6 q l^2 }{ \varepsilon_0}$
• B. $\frac{ q }{ 6 l^2 \varepsilon_0}$
• C. zero
• D. $\frac{ q }{ \varepsilon_0}$

Answer 1

Answer: (D)

$\frac{ q }{ \varepsilon_0}$

Answer 2

Electric flux emerging from the cube does not depend on size of cube.
Total flux = $\frac{ q }{ \varepsilon_0}$