UPSEE 2018 Solved Paper

Given, point charges 30C,−20C and 10C are located at (−1,0,2),(0,0,0) and (1,5,−1).
Side of the cube =6m
As per Gauss' theorem, net electric flux passing through any closed surface =

qin

ε0

Here, qin =30−20+10=20C
∴ Net electric flux =

q

ε0

=

10

ε0