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Describe an experiment to determine the ...

Describe an experiment to determine the coefficient of thermal conductivity of a good conductor by Searle's method.

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In an experiment to determine the coefficient of viscosity of a liquid using the formual eta=(piPr^(4))/(8l Q) the radius of the capillary tube was measured to be 0.41 mm using an instrument of least count 0.001 cm, length l was measured usinga metre scale as 15 cm. The percentae error in the pressure difference is 0.4% and the percentage error in the volume of the liquid flow out per second Q is 0.3% what is the maximum percentage error in the coefficient of viscosity?