Question:medium

The force (F) required to maintain the flow of layers of a liquid is equal to (A = area of contact of layers, dz = distance between the layers, du = change in velocity, \(\eta\) = coefficient of viscosity)

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Remember Newton's law of viscosity as "Stress is proportional to Strain Rate". Stress = Force/Area. Strain Rate = Velocity Gradient (\(du/dz\)). The proportionality constant is the viscosity (\(\eta\)). This gives \(F/A = \eta (du/dz)\), which is the fundamental equation for viscous force.

Updated On: Mar 30, 2026

\( \eta \frac{du}{dz} \frac{1}{A} \)
\( \eta \frac{dz}{du} A \)
\( \eta A \frac{du}{dz} \)
\( \eta \frac{dz}{A} \frac{1}{du} \)

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The Correct Option is C

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