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To measure the radius of the drop Millikan used \( _{-1-}- \) law of freely falling drops.

1. Poiseuille's
2. Ostwald's
3. Brewester's
4. stoke's

Correct answer: stoke's

Solution

Stokes’ law gives the viscous drag on a small spherical drop moving through a fluid, which lets Millikan relate the drop’s terminal speed to its radius. The other laws are unrelated to this falling-drop measurement.

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