For the effective working of wind mills, the minimum wind speed required is

5 k m / h

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15 k m / h

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40 k m / h

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30 k m / h

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Solution

The correct option is B
$15 k m / h$
The minimum wind speed necessary for satisfactory working of a wind mill is about 15 km/h.

Hence, the correct answer is option (b).

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