Answer to Question #264611 in Physics for jay

Question

This question refers to a perfectly lagged bar comprised of materials X, Y and Z of

conductivities k x , k y , and k z respectively. The graph shown indicates the variation of temperature

θ with distance D from the hotter end of the bar when a temperature difference is set up across

the length. Steady state conditions prevail and each material is of length 20 cm.

Lagged bar

110 0 C X Y Z 25 0 C

θ / 0 C D/cm

110

25

20 40 60 D/cm

X Y Z

Which of the following is true of the conductivities of X, Y and Z?

A) k x > k y > k z

B) k x > k z > k y

C) k y > k z > k x

D) k z > k x > k y

Answer 1

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