Question

is there any reason to take the specimen in the form of a disc​

Answer 1

Answer:

Why? The specimen is taken in the form of disc in Lee's disc method to find the thermal conductivity of a bad conductor.

Explanation:

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Answer 2

The sample is manufactured in the form of a thin disc with a large cross sectional area compared to the area exposed at the edge to keep the loss from the sides to a minimum. Maintaining a large 'A' and a small 'x' results in a high rate of energy transfer across the sample.