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Questions  >>  JEEMAIN and NEET  >>  NEET PAST PAPERS  >>  2017
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Q)

Two rods A and B of different materials are welded together as shown in figure. Their thermal conductivities are $K_1$ and $K_2$. The thermal conductivity of the composite rod will be <br>



( A ) $\frac{3(K_1 + K_2)}{2}$
( B ) $2 (K_1 + K_2)$
( C ) $K_1 + K_2$
( D ) $\frac{K_1 + K_2}{2}$

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