Q1. Two solid spherical balls of radius r1 & r2 (r2 < r1) and density σ are tied up with a string and released in a viscous liquid of lesser density ρ and coefficient of viscosity η, with the string just taut as shown. The terminal velocity of the spheres is:Physics — Physics of Solids — Question 1 of 123A. Option A: vt = (2/9) * (σ - ρ) * g * r1² / ηB. Option B: vt = (2/9) * (σ - ρ) * g * r2² / ηC. Option C: vt = (2/9) * (σ - ρ) * g * (r1² + r2²) / (2 * η)D. Option D: vt = (4/9) * (σ - ρ) * g * r1 * r2 / ηPractice more Physics MCQs for entrance exam preparation on Examora.io. Next Question →