Question

please solve this urgent physics class 12 electrostatics
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Answer 1

Given:

Charge Q is placed at a corner of the cube

To find:

Electric flux through any one of the faces not touching the charge

Concept:

First of all , whenever a charge is kept at one corner , there are 3 faces which touch it . Flux through those faces will be zero because the solid angle of those faces are zero.

Now , there are 3 other faces which is not in contact with the charge Q ,

So equal flux shall be divided among the faces (not touching the charge)

Let Flux through one face be $\phi$

$\boxed{\huge{\phi=\dfrac{Q}{3\epsilon_{0}}}}$