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PhysicsNEET 2024Surface tension, capillarity, excess pressure

Mechanical Properties of Fluids

A thin flat circular disc of radius 4.5 cm is placed gently over the surface of water. If the surface tension of water is , then the excess force required to take it away from the surface is:

  1. A.198 N
  2. B.1.98 mN
  3. C.99 N
  4. D.19.8 mN

Solution

A disc lifted off a liquid surface is held by surface tension along its full circumference: N mN.

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