Total electric flux coming out of a unit positive charge put in air is 

(1) ε0

(2) ε01

(3) (4pε0)1

(4) 4πε0 

Concept Videos :-

#22 | Electric Flux
#23 | Gauss Theorem
#24 | Charged Infinite Wire (Gauss Theorem)
#25 | Charged Infinite Sheet (Gauss Theorem)
#26 | Charged Thin Conducting Shell (Gauss Theorem)
#27 | Solid Non Conducting Sphere : Gauss Theorem
#28 | Solid Sphere With Cavity : Gauss Theorem
#29 | Early Model of Atom (Gauss Theorem)
#30 | EFI Inside a Metal (Gauss Theorem)
#31 | Faraday Cages (Gauss Theorem)

Concept Questions :-

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