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

$(A)\;\in _0 \\ (B)\;\in_0^{-1} \\ (C)\; 4 \pi \in _0 \\ (D)\;\frac{1}{4 \pi \in _0}$

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By Gauss's theorem,
$\phi= \large\frac{q}{\in _0} =\frac{1}{\in _0}$
Charge is unity
=>$\phi =\in _0^{-1}$
Hence B is the correct answer.
answered Jan 3, 2014 by meena.p
 

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