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A force that is caused due to attraction of particles in the layer of fluid bulk is called?

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A force that is caused due to attraction of particles in the layer of fluid bulk is called?

(a) Viscous force

(b) Inertial force

(c) Surface tension force

(d) Pressure force

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This intriguing question comes from Types of Forces Acting in Moving Fluid in chapter Dimensional and Model Analysis of Fluid Mechanics

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The correct option is (c) Surface tension force

Easiest explanation: Surface tension is caused due to the attraction of particles in the surface layer of the fluid in bulk quantities. Surface tension force is defined as the product of surface tension and length of flowing fluid.

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