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Q. A hollow copper cylinder is to be fitted over a steel piston. At 23°C the inside diameter of the cylinder is 99.5% of the outside diameter of the piston. To what common temperature should the two pieces be heated in order that the cylinder just fit over the piston?

Q. A +4.75 x 10^-6 C and a 3.55 X 10^-6 C are placed 18.5 cm apart. Where can a third charge be placed so that it experiences no net force?

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