A composite rod is made of two materials X and Y and its two ends are maintained at 100 °C and 0 °C respectively, as shown in figure 7. 34. 100 °C 0°C x= 25.0cm y = 75.0 cm Figure 7 If the composite rod is well lagged, what is the ratio of the conductivity of y to that of x? A 1:2 В 2:1 C 1:1 D 1:4
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