### How much work must be done to bring three electrons

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Q. What is the mass of an ice cube, taken from a -19.0^circ C freezer, that will cool your coffee to a pleasant 59.0^circ?

Q. How much work must be done to bring three electrons from a great distance apart to within 2.1×10-10 {rm m} from one another (at the corners of an equilateral triangle)?

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