A metallic prong consists of 4 rods made of the same material, cros...

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A metallic prong consists of 4 rods made of the same material, cross - section and same lengths as shown.
\( \mathrm{P} \)
The three forked ends are kept at \( 100^{\circ} \mathrm{C} \) and the handle
W end is at \( 0^{\circ} \mathrm{C} \). The temperature of the junction is[KVPY 2013]
(a) \( 25^{\circ} \mathrm{C} \)
(b) \( 50^{\circ} \mathrm{C} \)
(c) \( 60^{\circ} \mathrm{C} \)
(d) \( 75^{\circ} \mathrm{C} \)
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