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  4. A point charge Q is placed at one of the vertices of a cubical block. The electric flux flowing through this cube is

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Q. A point charge Q is placed at one of the vertices of a cubical block. The electric flux flowing through this cube is

ManipalManipal 1980Electric Charges and Fields

Solution:

In this case by placing three at three sides of given cube and four cube above, the charge will be in the centre. So the flux linked with each case will be one eight of the flux $ \frac{ Q}{ \varepsilon_0 }$
Flux associated with given cube = $ \frac{ Q}{ 8 \varepsilon_0 }$