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A particle A of diameter 10 microns settles in an oil of specific gravity 0.9 and viscosity 10 poise under Stoke's law. A particle B with diameter 20 microns settling in the same oil will have a settling velocity

same as that of A.
one fourth as that of A.
twice as that of A.
four times as that of A.

Correct Answer: one fourth as that of A.

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