A non-uniform cube of side a and mass m rests on a rough horizontal table. A horizontal force F is applied normal to one of the faces at a point that is directly above the centre of the face, at a height 3a/4 above the base. The minimum value of F for which the cube begins to tilt about the edge is (assume that the cube does not slide )
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Gauss's theorem states that total electric flux through a closed surface enclosing a charge is 1/ε 0 times of the total charge enclosed by the surface ,
ϕ=Q/ε 0
It is clear that only charge q 2 and q 4
are enclosed by the Gaussian surface therefore only these two charges will contribute to electric flux through the sphere .
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