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[" Q "46." A copper ball of radius "r" i...

[" Q "46." A copper ball of radius "r" is moving with a uniform "],[" velocity "u" in the mustard oil.The dragging force acting "],[" on the ball is "F" .The dragging force on the copper ball "],[" of radius "2r" moving with uniform velocity "2u" in the "],[" mustard oil is "],[[" (a) "F," (b) "2F],[" (c) "4F," (d) "8F]]

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