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Q.

A point charge $+ q$ is placed at mid point of a cube of side 'L'. The electric flux emerging from the cube is

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a

$\frac{q}{ε_{0}}$

b

$\frac{6 {qL}^{2}}{ε_{0}}$

c

$\frac{q}{6 L^{2} ε_{0}}$

d

zero

answer is A.

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Detailed Solution

By Gauss theorem

$Total electric flux = \frac{Total charge inside cube}{ε_{0}}$

$\Rightarrow ϕ = \frac{q}{ε_{0}}$

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