2. Questions Bank
  3. JEE Main & Advanced
  4. Physics
  5. Transmission of Heat

JEE Main & Advanced Physics Transmission of Heat Question Bank Conduction

  • question_answer
    Two identical rods of copper and iron are coated with wax uniformly. When one end of each is kept at temperature of boiling water, the length upto which wax melts are \[8.4cm\] and \[4.2cm\] respectively. If thermal conductivity of copper is 0.92, then thermal conductivity of iron is [MP PET 1995]

    A)            0.23                                          

    B)            0.46

    C)            0.115                                       

    D)            0.69

    Correct Answer: A

    Solution :

               \[\frac{{{K}_{1}}}{{{K}_{2}}}=\frac{l_{1}^{2}}{l_{2}^{2}}\] \[\therefore \]\[{{K}_{2}}=\frac{{{K}_{1}}l_{2}^{2}}{l_{1}^{2}}=\frac{0.92\times {{(4.2)}^{2}}}{{{(8.4)}^{2}}}=0.23\]


You need to login to perform this action.
You will be redirected in 3 sec spinner