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In crystals of the salt cesium, cesium ions Cs^(+) form the eight corners of a cube and a chlorine ion Cl^(-) is at the cube's center Fig. The edge length ofthe cube is 0.40 nm. The Cs^(+) ions are each deficient by one electron (and thus each has a charge of -e), and the Cl^(-) ion has one excess electron (and thus has a charge of -e). (a) What is the magnitude of the net electrostatic force exerted on the Cl^(-) ion by the eight Cs^(+) ions at the corners of the cube? (b) If one of the Cs^(+) ions is missing, the crystal is said to have a defect, what is the magnitude of the net electrostatic force exerted on the Cl^(-) ion by the seven remaining Cl^(+) ions ? |
| Answer» SOLUTION :(a) 0, (B) `1.9 XX 10^(-9)N` | |