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Q1 The end Q and R of two thin wires PQ and RS are soldered...

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Q1 The end Q and R of two thin wires PQ and RS are soldered joined together Initially each of the wires has a length of 1 m at 10 C Now the end P is main tained at 10 C while the end S is heated and main tained at 400 C 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 x 10 5 K 1 2016 the change in length of the wire PQ is B 0 90 mm A 0 78 mm C 1 56 mm D 2 34 mm

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