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A metal rod of length \( 2 m \) has cross sectional areas \( 2 A \) and \( A \) as shown in figure. The ends are maintained at temperatures
\( \mathrm{P} \) \( 100^{\circ} \mathrm{C} \) and \( 70^{\circ} \mathrm{C} \). The temperature at middle point \( C \) is

W
[CPMT 2000]
(a) \( 80^{\circ} \mathrm{C} \)
(b) \( 85^{\circ} \mathrm{C} \)
(c) \( 90^{\circ} \mathrm{C} \)
(d) \( 95^{\circ} \mathrm{C} \)
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