Three rods made of the same material and having the same cross-section have been joined as shown in Figure 4.38. Each rod is of the same length. The left and right rods are kept at $0^{\circ}$ C and $9 0^{\circ}$ C respectively. The temperature of the junction of the three rods will be:

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Two of the rods lead to 9 0 ∘ C ends and one to the 0 ∘ C end. With equal conductances, the net flow into the junction is zero: ( T − 0 ) = ( 90 − T ) + ( 90 − T ) . So 3 T = 180 and T = 6 0 ∘ C. B.

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