If a small paddle wheel is placed anywhere in an ideal fluid,

it rotates about the wheels center of mass

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it does not rotate about the wheels center of mass

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it rotates about any point in the fluid.

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None of these

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Solution

The correct option is B it does not rotate about the wheels center of mass
Ideal fulid flow is irrotational. In irrotational flow, the fluid has no angular momentum about any point. If a small paddle wheel placed anywhere in the fluid does not rotate about the wheel’s center of mass, then the flow is irrotational.

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