a point charge of +20 micro coulumb is placed at one corner of a cube of side 10cm. what is the fux passing through the cube.
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If charge is at the corner then it will be shared by 8 cubes
Charge for 1 cube =
8
q
Now in any given cube if is touching
3 out of 9 of its faces. So the area vector of that side and the electric field vector will be perpendicular. So flux through those 3 sides will be 0. Equal amount of flux will flow from other 3 sides
So flux through 1 sides=(
8
q
)/3
=
8×3
q
=
24
q
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