Four rods of same material and having the same cross section and length have been joined, as shown. The temperature of the junction of four rods will be ............... $^{\circ} C$
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(c)
Incoming heat $=$ outgoing heat
$\left(90^{\circ}-\theta\right)+\left(60^{\circ}-\theta\right)=\theta-30^{\circ}+\theta-0^{\circ}$
$180^{\circ}=4 \theta$
$45^{\circ} C =\theta$
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