Class-12th Physics,
Electric Charges and Fields,
Chapter-1, Exercise -1, Q-1.19
NCERT Solutions for Class 12th Physics
A point charge of 2.0 μC is at the centre of a cubic Gaussian surface 9.0 cm on edge. What is the net electric flux through the surface?
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Net electric flux (ΦNet) through the cubic surface is given by
ΦNet =q/ε0
Where,
ε0 = Permittivity of free space = 8.854 x 10⁻12 N⁻1C2 m⁻2
q = Net charge contained inside the cube = 2.0 µC = 2 x 10⁻6 C
Therefore ΦNet =(2 x 10⁻6)/8.854 x 10⁻12
=2.26 x 10⁵Nm2C⁻1
The net electric flux through the surface is 2.26 x 10⁵Nm2C⁻1