Electric Charges And Fields Ques 30

30. What is the flux through a cube of side ’ $a$ ’ if a point charge of $q$ is at one of its corner : [2012]

(a) $\frac{2 q}{e_0}$

(b) $\frac{q}{8 e_0}$

(c) $\frac{q}{e_0}$

(d) $\frac{q}{2 e_0}$

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Answer:

Correct Answer: 30.(b)

Solution:

  1. (b) Eight identical cubes are required to arrange so that this charge is at centre of the cube formed so flux.

$f=\frac{q}{8 e_0}$

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