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Question

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


A
qϵ0
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B
Zero
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C
6qL2ϵ0
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D
q6L2ϵ0
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Solution

The correct option is A $$\frac {q}{\epsilon_0}$$
Applying Gauss's law, electric flux $$(\phi)=\int \vec E.\hat{n}ds=\dfrac{Q_{net}}{\epsilon_0}$$
therefore, $$\phi=\dfrac{q}{\epsilon_0}$$
Ans: (A)

Physics

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