Flux Question

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Q>  If the electric flux entering and leaving an enclosed surface
respectively is Φ1 and Φ2
, the electric charge inside the surface
will be
(a) (Φ2+Φ2) × εo
(b) (Φ2– Φ2) × εo
(c) (Φ1+ Φ2) × εo
(d) (Φ2 – Φ1) × εo


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