Question

calculate the pressure exerted by a brick which applies a froce of 4.5 N. (a) it is
placed upright on the soil (b ) when it is placed on its so
widest base. The dimension
of the brick are30cm x 15 cm x 10cm.
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Answer 1

Answer:

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 .