Physics-
General
Easy

Question

Three rods made of same material and having same cross-section are joined as shown in the figure. Each rod is of same length. The temperature at the junction of the three rods is

  1. 45℃    
  2. 90℃    
  3. 30℃    
  4. 60℃    

The correct answer is: 60℃


    Let the temperature of function be theta, then
    H equals H subscript 1 end subscript plus H subscript 2 end subscript
    rightwards double arrow fraction numerator K A left parenthesis theta minus 0 right parenthesis over denominator L end fraction equals fraction numerator K A left parenthesis 90 minus theta right parenthesis over denominator L end fraction plus fraction numerator K A left parenthesis 90 minus theta right parenthesis over denominator L end fraction

    Or theta equals 90 minus theta plus 90 minus theta
    Or theta equals 180 minus 2 theta
    Or 3 theta equals 180
    Or theta equals 60 ℃

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