The ends Q and R of two thin wires PQ and RS are soldered

Last updated: 6/21/2023

The ends 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 maintained at 10 C while the end S is heated and maintained 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 2x10 K the change in length of the wire PQ is UJEE Advanced 2016 0 78 mm 0 90 mm 1 56 mm 2 34 mm