Verified Solution • 2025–26 Session
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QNEET-2013-Ph-1609: NEET 2013 Physics - Class 11 NEET-2013-Ph-1609 Solution: Two metal rods 1 and 2 of same lengths have same temperature…
Two metal rods 1 and 2 of same lengths have same temperature difference between their ends. Their thermal conductivities are and and cross sectional areas and respectively. If the rate of heat conduction in 1 is four times that in 2 then
Multiple Choice Options
- A K 1 A 1 = 4K 2 A 2
- B K 1 A 1 = 2K 2 A 2
- C 4K 1 A 1 = K 2 A 2
- D K 1 A 1 = K 2 A 2
Step-by-Step Verified Solution
Let L be length of each rod. Rate of heat flow in rod 1 for the temperature difference _ T is
H 1 = K 1 A 1 _ T L
Rate of heat flow in rod 2 for the same difference _ T is
H 2 = K 2 A 2 _ T L
As per question, H 1 = 4H 2
K 1 A 1 _ T L = 4 K 2 A 2 _ T L
_ K 1 A 1 = 4 K 2 A 2