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A balloon filled with hydrogen will

  • A.Continue going upwards uninterrupted
  • B.Reach a particular height and remain floating
  • C.Burst after reaching some height
  • D.Reach a particular height and start coming down

Answer: B

It will reach a particular height and remain floating.

The balloon rises while the buoyant force exceeds its weight. As it climbs, the air thins and the upthrust \(\rho_{air}Vg\) falls, until it just balances the weight; there the balloon settles and floats.

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