The electric flux from a cube of edge I is 0. If an edge of the cube is made 21 and the charge
enclosed is halved, its value will be
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ϕ
1
=
ϵ
0
q
q
′
=
2
q
and ϕ is independent of dimensions
ϕ
2
=
2ϵ
0
q
=
2
ϕ
1
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