A composite rod of uniform cross-section has copper and aluminium sections of the same length in...

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A composite rod of uniform cross-section has copper and aluminium sections of the same length in good thermal contact. The ends of the rod, which is well-lagged, are maintained at \( 100^{\circ} \mathrm{C} \) and at \( 0^{\circ} \mathrm{C} \) as shown in the diagram (Figure-4.33). The thermal conductivity of copper is twice that of aluminium.
Which one of the following graphs represents the variation of temperature \( T \) with distance \( x \) along the rod in the steady state ?
(A)
(B)
(C)
(D)
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