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The ends Q and R of two thin wires, PQ and RS, are soldered (joined)...

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The ends Q and R of two thin wires, PQ and RS, are soldered (joined) together. Initially, each of the wire has a length of 1 m 10C. Now, the end P is maintained at 10C, while the end S is heated and maintained at 400C. The system is thermally insulated from its surroundings. If the thermal conductivity of wire PQ is twice that of the wire RS and the coefficient of linear thermal expansion of PQ is 1.2 10 K -1 -, the change in length of the wire PQ is (a) 0.78 mm (b) 0.90 mm (c) 1.56 mm (d) 2.34 mm

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