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Option 3 : Only III 

Various applications of Bernoulli's Principle can be observed in the following cases:

  • It can be used to calculate the lift force on an airfoil. 
  • The carburetor which is used in many engines uses a venturi which works based on Bernoulli's Principle. 
  • An injector on a steam locomotive 
  • The static port and pilot tube of an aircraft

Blowing between two suspended spheres, inflating a large bag or suspending a ball in an airstream, etc. cannot be explained by the application of Bernoulli's Principle though these are often considered as the applications of this principle.

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