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Most Important Selected Qs for JEE AdvancedPhysicsThermal Properties of Matter

Two conductors A and B each of cross section area 5 ~cm ^2 are connected in series. Variation of temperature (in ^ C ) along the length (in cm ) is as shown in the figure. If thermal conductivity of A is 200 J / m -sec- ^ C and the heat current in the conductors is 0.173 ~J / s . The thermal conductivity of B is K 50 3 ~J / m - sec ^ C . Find the value of K.

Correct answer

4

Step-by-step solution

aligned & Q t =K_A A d T d x & d T d x in conductor A= slope of graph = 3 aligned Since both conductors are connected in series, same heat current will flow in A and B . K _ B = Q t 1 ~A dT dn = t 1 ~A 45^ =200 3 ~J / m - sec ^ C

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