What is critical thickness of insulation for a spherical insulator? – McqOptions

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1.	What is critical thickness of insulation for a spherical insulator?
A.	<sup>K</sup> <sub>H</sub>
B.	( frac{2K}{H} )
C.	( frac{4K}{H} )
D.	<sup>H</sup> <sub>K</sub>
Answer» C. ( frac{4K}{H} )

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