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Viscosity is said to be internal friction between fluid layers. What type of force is it?

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in Physics – Class 11 by (74.2k points)
Viscosity is said to be internal friction between fluid layers. What type of force is it?

(a) Electromagnetic

(b) Gravitational

(c) Weak Nuclear forces

(d) Strong Nuclear forces

I had been asked this question in exam.

This interesting question is from Fluids Mechanical Properties topic in division Mechanical Properties of Fluids of Physics – Class 11

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The correct choice is (a) Electromagnetic

Explanation: At the contact surface of two bodies (here, fluid layers) molecular bonds are formed. When there is relative motion between them these bonds try to oppose it. This is how friction works. Therefore we can say it is an electromagnetic force as molecular bonds are considered to be electromagnetic forces.

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