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Questions  

If the electric flux entering and leaving an enclosed surface respectively is ϕ1 and ϕ2 the electric charge inside the surface will be 

a
(ϕ1+ϕ2)ε0
b
ϕ2−ϕ1ε0
c
ϕ1+ϕ2/ε0
d
ϕ2−ϕ1/ε0

detailed solution

Correct option is B

ϕnet=1ε0×Qenc⇒Qenc=ϕ2−ϕ1ε0

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