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Physics-

General

Easy

Question

Five identical rods are joined as shown in figure. Point $A$ and $C$ are maintained at temperature $120 ℃$ and $20 ℃$ respectively. The temperature of junction $B$ will be

$100 ℃$
$80 ℃$
$70 ℃$
$0 ℃$

The correct answer is: $70 ℃$

If thermal resistance of each rod is considered $R$ then, the given combination can be redrawn as follows

$open parentheses H e a t blank c u r r e n t close parentheses subscript A C end subscript equals open parentheses H e a t blank c u r r e n t close parentheses subscript A B end subscript$
$fraction numerator left parenthesis 120 minus 20 right parenthesis over denominator 2 R end fraction equals fraction numerator left parenthesis 120 minus theta right parenthesis over denominator R end fraction rightwards double arrow theta equals 70 ℃$

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