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Figure shows a weigh-bridge, with a beaker P with water on one pan and a balancing weight R on the other. A solid ball Q is hanging with a thread outside water. It has volume 40 $c m^{3}$ and weighs 80 g. If this solid is lowered to sink fully in water, but not touching the beaker anywhere, the balancing weight R’ will be

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same as R

40 g more than R

40 g less than R

80 g more than R

answer is D.

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Detailed Solution

Upthrust = weight of 40 $c m^{3}$ of water = 80 g = down thrust on water

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