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Question

A beaker is filled with water to its brim. A child while playing drops his ball of mass 1 kg into it and eventually ends up wetting himself with water. He weighs the water fallen on him and found it to be 1 N. Assuming that the ball is dropped slowly and all the spilled-over water fell on the child, find the buoyant force acting on the ball.


A

1N

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B

9.8 N

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C

980 N

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D

1 kg

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Solution

The correct option is A

1N


According to Archimedes principle, the weight of the liquid displaced is equal to the buoyant force. Here the weight of the displaced liquid is 1 N, so the buoyant force will also be 1 N.


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