The figure represents a crystal unit of caesium chloride, CsCl. The caesium atoms, represented by open circles are situated at the corners of a cube of side 0.40 nm, whereas a Cl-atom is situated at the centre of the cube. The Cs-atoms are deficient in one electron while the Cl-atom carries an excess electron.
(i) What is the net electric field on the Cl-atom due to eight Cs-atoms?
(ii) Suppose that the Cs-atom at corner A is missing. What is the net force now on the Cl-atom due to seven remaining Cs-atoms?
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