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NEET 2012 (AIPMT, Prelims) · Electric Flux & Gauss's Law

Electric Flux & Gauss's Law question from NEET 2012 (AIPMT, Prelims)

Q117NEET 2012 · AIPMT · PRELIMSEasy

Electric Flux & Gauss's Law

What is the flux through a cube of side $a$ if a point charge of q is at one of its corners?

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Answer: (b)

A charge at a corner is shared by 8 identical cubes meeting at that corner.
Flux through one cube $= \dfrac{1}{8}\cdot\dfrac{q}{\varepsilon_0} = \dfrac{q}{8\varepsilon_0}$ .
So the answer is (b).

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