a) Presumably zero. All forces should cancel.
b) The four matched corners will again cancel so this leaves only the unmatched corner.the distance between them can be found by pythagorean with one side 4nm the other (a diagonal across the bottom say) is 4sqrt(2) nm. Then use Coulombs law, kq1q2/r(sqr).
A picture might help...just doing this in my head.
A CsCl (cesium chloride) salt crystal is built from the unit cells shown in the figure below. Cl− ions form the corners of a cube and a Cs+ ion is at the centre of the cube. The edge length of the cube, which is called the lattice constant, is 0.4 nm.
(a) What is the magnitude of the net force exerted on the cesium ion by its eight nearest Cl− neighbours? in N
(b) If the Cl− in the lower left corner is removed, what is the magnitude of the net force exerted on the cesium ion at the centre by the seven remaining nearest chlorine ions? in N
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