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Q.

If the electric flux entering and leaving an enclosed surface respectively is $ϕ_{1}$ and $ϕ_{2}$ , the electric charge inside the surface will be

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a

$(ϕ_{2} - ϕ_{1}) ε_{0}$

b

$\frac{(ϕ_{1} - ϕ_{2})}{ε_{0}}$

c

$\frac{(ϕ_{2} - ϕ_{1})}{ε_{0}}$

d

$(ϕ_{1} - ϕ_{2}) ε_{0}$

answer is A.

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Conceptual (Gauss theorem)

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