Verified Solution • 2025–26 Session moderate

QNEET-2017-Ph-984: NEET 2017 Physics - Class 11 NEET-2017-Ph-984 Solution: Two rods A and B of different materials are welded together as…

Two rods A and B of different materials are welded together as shown in figure. Their thermal conductivities are K1K_1 and K2K_2. The thermal conductivity of the composite will be 32(K1+K2)\frac{3}{2}(K_1+K_2) K1+K2K_1+K_2 2(K1+K2)2(K_1+K_2) K1+K22\frac{K_1+K_2}{2}

Multiple Choice Options

  • A 3(K1+K2)2{{3\left( {{K_1} + {K_2}} \right)} \over 2} 2 3 ( K 1 _ + K 2 _ ) _
  • B K1+K2{K_1} + {K_2} K 1 _ + K 2 _
  • C 2(K1+K2)2\left( {{K_1} + {K_2}} \right) 2 ( K 1 _ + K 2 _ )
  • D K1+K22{{{K_1} + {K_2}} \over 2} 2 K 1 _ + K 2 _ _

Step-by-Step Verified Solution

Equivalent thermal conductivity of the composite rod in parallel combination will be, K = K 1 A 1 + K 2 A 2 A 1 + A 2 = K 1 + K 2 2

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