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If the electric flux entering and leaving a closed surface are respectively of magnitude ϕ1 and ϕ2 then the electric charge inside the surface will be
A. ϕ1−ϕ2ϵ0
B. (ϕ1−ϕ2)ϵ0
C. ϵ0(ϕ2−ϕ1)
D. ϵ0(ϕ2+ϕ1)

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