Question:medium
The terminal velocity of a steel ball of radius r and density \(\rho\) falling through an oil column of density \(\sigma\) and viscosity \(\eta\) is
The terminal velocity of a steel ball of radius r and density \(\rho\) falling through an oil column of density \(\sigma\) and viscosity \(\eta\) is
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Remember the dependence of various parameters in Stokes' law. Force is proportional to \(r\), but terminal velocity is proportional to \(r^2\) because the weight of the ball grows with \(r^3\).
Updated On: Jun 24, 2026
- directly proportional to r
- inversely proportional to r
- directly proportional to \(\eta\)
- directly proportional to r\(^2\)
- inversely proportional to r\(^2\)
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The Correct Option is D
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