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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 1.2 × 10–5 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
Correct answer is option 'A'. Can you explain this answer?
Verified Answer
The ends Q and R of two thin wires, PQ and RS, are soldered (joined) t...
The heat flow rate is same
The temperature gradient access Pd is
Therefore change temperature at a cross-section M distant ‘x’ from P is
Extension in a small elemental length ‘dx’ is
 
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The ends Q and R of two thin wires, PQ and RS, are soldered (joined) t...
°C. The coefficient of linear expansion of the wires is 0.000011/°C.

a) What is the change in length of each wire when the temperature is raised to 50°C?
b) What is the final length of each wire at 50°C?
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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 1.2 × 10–5 K–1, the change in length of the wire PQ isa)0.78 mmb)0.90 mmc)1.56 mmd)2.34 mmCorrect answer is option 'A'. Can you explain this answer?
Question Description
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 1.2 × 10–5 K–1, the change in length of the wire PQ isa)0.78 mmb)0.90 mmc)1.56 mmd)2.34 mmCorrect answer is option 'A'. Can you explain this answer? for JEE 2024 is part of JEE preparation. The Question and answers have been prepared according to the JEE exam syllabus. Information about 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 1.2 × 10–5 K–1, the change in length of the wire PQ isa)0.78 mmb)0.90 mmc)1.56 mmd)2.34 mmCorrect answer is option 'A'. Can you explain this answer? covers all topics & solutions for JEE 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for 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 1.2 × 10–5 K–1, the change in length of the wire PQ isa)0.78 mmb)0.90 mmc)1.56 mmd)2.34 mmCorrect answer is option 'A'. Can you explain this answer?.
Solutions for 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 1.2 × 10–5 K–1, the change in length of the wire PQ isa)0.78 mmb)0.90 mmc)1.56 mmd)2.34 mmCorrect answer is option 'A'. Can you explain this answer? in English & in Hindi are available as part of our courses for JEE. Download more important topics, notes, lectures and mock test series for JEE Exam by signing up for free.
Here you can find the meaning of 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 1.2 × 10–5 K–1, the change in length of the wire PQ isa)0.78 mmb)0.90 mmc)1.56 mmd)2.34 mmCorrect answer is option 'A'. Can you explain this answer? defined & explained in the simplest way possible. Besides giving the explanation of 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 1.2 × 10–5 K–1, the change in length of the wire PQ isa)0.78 mmb)0.90 mmc)1.56 mmd)2.34 mmCorrect answer is option 'A'. Can you explain this answer?, a detailed solution for 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 1.2 × 10–5 K–1, the change in length of the wire PQ isa)0.78 mmb)0.90 mmc)1.56 mmd)2.34 mmCorrect answer is option 'A'. Can you explain this answer? has been provided alongside types of 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 1.2 × 10–5 K–1, the change in length of the wire PQ isa)0.78 mmb)0.90 mmc)1.56 mmd)2.34 mmCorrect answer is option 'A'. Can you explain this answer? theory, EduRev gives you an ample number of questions to practice 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 1.2 × 10–5 K–1, the change in length of the wire PQ isa)0.78 mmb)0.90 mmc)1.56 mmd)2.34 mmCorrect answer is option 'A'. Can you explain this answer? tests, examples and also practice JEE tests.
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