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Q.

Why does a hydrogen gas-filled balloon rise in the air?

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a

The buoyant force exerted on it is smaller than the gravitational force.

b

Gravitational force is not exerted on the balloon.

c

The buoyant force exerted on it is equal to the gravitational force.

d

The buoyant force exerted on it is larger than the gravitational force.

answer is A.

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Detailed Solution

 

  • A hydrogen gas-filled balloon also displaces air due to which air exerts a buoyant force or upthrust on the balloon.
  • Since the density of air is greater than the density of hydrogen gas, the buoyant force exerted in the upward direction by the air is greater than the gravitational force exerted on the balloon in the downward direction.
  • As a result, the balloon rises up in the air.

Therefore, 'The buoyant force exerted on it is larger than the gravitational force.' is the correct response.

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