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In designing a method for measuring the ...

In designing a method for measuring the thermal conductivity of polystyrene, care must be taken to choose a specimen of appropriate dimensions as well as to decide whether or not the specimen requires lagging. Which ofthe following would be the correct choice ?

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The correct Answer is:
( C )
For high rate of heat conduction area of cross section should be large and thickness should be low and for a thin sampleas heat will conduct quickly no lagging is required.
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