Question
1.19: 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?
Answer:
Method - 1
Net electric flux (ΦNet)
through the cubic surface is given by,
Where,
∈0 = Permittivity of free space = 8.854 × 10−12
N−1C2 m−2
q = Net charge
contained inside the cube = 2.0 µC = 2 × 10−6 C
= 2.26 × 105
N m2 C−1
The net electric flux
through the surface is 2.26 ×105 N m2C−1.
Method - 2
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