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Three identical rods \( \mathrm{AB}, \mathrm{CD} \) and \( \mathrm{PQ} \) are joined as shown. \( \mathrm{P} \) an \( \mathrm{Q} \) are mid points of \( \mathrm{AB} \) and \( \mathrm{CD} \) respectively. Ends A,
\( \mathrm{P} \) \( \mathrm{B}, \mathrm{C} \) and \( \mathrm{D} \) are maintained at \( 0^{\circ} \mathrm{C}, 100^{\circ} \mathrm{C}, 30^{\circ} \mathrm{C} \) and \( 60^{\circ} \mathrm{C} \)

W. respectively. The direction of heat flow in PQ is
(a) from \( \mathrm{P} \) to \( \mathrm{Q} \)
(b) from \( \mathrm{Q} \) to \( \mathrm{P} \)
(c) heat does not flow in PQ
(d) data not sufficient
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