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Question

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



A
qε0
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B
6ql2ε0
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C
q6l2ε0
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D
zero
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Solution

The correct option is A $$\dfrac{q}{\varepsilon _{0}}$$
Gauss law: $$\oint E\cdot da=\dfrac {q_{enclosed}}{\varepsilon_0}$$
Now, the total flux emerging from the cube $$=\dfrac {q}{\epsilon_0}$$ as $$q$$ is enclosed by cube.
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Physics

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