A point charge q is placed at the centre of a cube. What is the flux linked. a with all the faces of the cube? b. with each face of the cube? c. if charge is not at the centre, then what will be the answer of parts a and b ?
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Given,
a charge is placed at the centre of the cube then
(a) flux linked with all faces (6 faces)
By Gausse's theorem
Phi =q/€○
(b)flux linked with 1 face are
As we calculate flux linked with 6 faces are
6×phi=q/€○
Since ,phi =q/6€○
(c) If charge is not placed at the centre then answer of (a)&(b)is not equal to q/€○&q/6€○respectively because amount of charge entering and leaving the surface would be different.
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