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There are three thermometers{one in contact with the skin of the man, other in between the vest and the shirt and third in between the shirt and coat. The readings of the thermometers are 30oC,25oC and 22oC, respectively. If the vest and the shirt are of the same thickness, the ratio of their thermal conductivities is
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Correct option is D
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Three rods made of the same material and having the same cross-section have been joined as shown in Fig. Each rod is of the same length. The left and right ends are kept at 0°C and 90°C, respectively. The temperature of the junction of the three rods will be
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