Biot Number signifies

The ratio of heat conduted to heat convected

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The ratio of heat convected of heat conducted

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The ratio of external Convective resistance to internal conductive resistance

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The ratio of internal conductive resistance to external convective resistance

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Solution

The correct option is D

The ratio of internal conductive resistance to external convective resistance
Biot number,
$B i = \frac{h l}{k} = \frac{h l A}{k A} = \frac{l / k A}{1 / h A} = \frac{R_{c o n d}}{R_{c o n v}}$

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