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A point charge q is placed at one corner...

A point charge q is placed at one corner of a cubical box. Find the total flux associated with that box .

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If q is placed as hsown , seven more identical cubes are required to enclose , that charge completely. Then the total flux through all faces of 8 cubes is `(q)/(in_(0))`. Now contribution of this flux through each cube ( including the given one ) is `(q)/(8 in_(0))`.
Here it is interesting to note that the faces which have common edge on which the given charge is kept have no flux and the flux `(q)/(8in_(0))` emerges through the remaining three faces fo the cube .
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