SELECT * FROM question_mgmt as q WHERE id=1139 AND status=1 SELECT id,question_no,question,chapter FROM question_mgmt as q WHERE courseId=3 AND subId=8 AND chapterId=115 and ex_no='1' AND status=1 ORDER BY CAST(question_no AS UNSIGNED)

Question:

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:

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.


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