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Two rods A and B of different materials are welded together as shown in figure. Their thermal conductivities are K1 and K2. The thermal conductivity of the composite rod will be
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3(K1 + K2) 2 - K1 + K2
- 2 (K1 + K2)
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K1 + K2 2
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Correct Option: D
Heat current H = H1 + H2
| = | + | ||
| d | d |
| = | = | [k1 + k2] | ||
| d | d |
Hence equivalent thermal conductivities for two rods of equal area is given by
| KEQ = | ||
| 2 |
