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  4. The total electric flux emanating from a closed surface enclosing an α-particle (e = electronic charge) is

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Q. The total electric flux emanating from a closed surface enclosing an $\alpha$-particle (e = electronic charge) is

KEAMKEAM 2011Electric Charges and Fields

Solution:

By Gauss theorem
$ | \phi_E | = \bigg | \frac{ q}{ \varepsilon_0 } \bigg | $
= $ \bigg | \frac{ - 2 e}{ \varepsilon_0 } \bigg | $
$ \frac{ q}{ \varepsilon} = \frac{ 2e}{ \varepsilon_0}$