The ratio of Nusselt number to Biot number is

Conductive resistance of fluid / Conductive resistance of solid

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Conductive resistance of fluid / Convective resistance of fluid

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Conductive resistance of solid / Conductive resistance of fluid

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Unity

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Solution

The correct option is A Conductive resistance of fluid / Conductive resistance of solid
$\frac{N u}{B i} = \frac{(\frac{c o n d u c t i v e r e s i s t a n c e o f f l u i d}{c o n v e c t i v e r e s i s t a n c e o f f l u i d})}{(\frac{c o n d u c t i v e r e s i s t a n c e o f s o l i d}{c o n v e c t i v e r e s i s t a n c e o f f l u i d})}$

$\frac{N u}{B i} = \frac{(c o n d u c t i v e r e s i s t a n c e o f f l u i d)}{(c o n d u c t i v e r e s i s t a n c e o f s o l i d)}$

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