Question

Expression for an electric field is given by $\vec{ E }=4000 x^2 i \frac{ V }{ m }$. The electric flux through the cube of side $20 \,$ when placed in electric field (as shown in the figure) is ___$V cm$.

Answer 1

Flux $=\vec{ E } \cdot \vec{ A }$
$=4000(0 \cdot 2)^2 \frac{ V }{ m } \cdot(0 \cdot 2)^2 m ^2$
$=4000 \times 16 \times 10^{-4} Vm$
$=640 \,Vcm$