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A heat flux of 4000 J/s is to be passed through a copper rod of length 10 cm and area of cross-section 100 sq. cm. The thermal conductivity of copper is 400 W/mC. The two ends of this rod must be kept at a temperature difference of –

1. 1ºC
2. 10ºC
3. 100ºC
4. 1000ºC (SECTION-B)

Correct answer: 100ºC

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