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Home  >>  AIMS  >>  Class12  >>  Physics  >>  Electric Charges and Fields
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A point charge causes and electric flux $-3 × 10^{14} N-m^2 /C$ to pass through a spherical Gaussian surface Calculate the value of the point charge.

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By Gauss’s theorem, total electric flux through closed Gaussian surface
$\phi =\large\frac{q}{\in _0}$
$q= \phi \in_0$
But electric flux passing through the surface
$\phi =-3 \times 10^{-14} N -m^2/C$
$q= (-3 \times 10^{-14} ) \times 8.85 \times 10^{-12}$
$\quad= -26.55 \times ^{-25} \;C$
$\quad= -2.655 \times 10^{-25}$
Hence B is the correct answer.
answered Jun 2, 2014 by meena.p
 

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