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  1. If a small sphere is let fall vertically in a large quantity of still liquid of density
  2. Eight drops of a liquid of density ρ and each of radius a are falling through air
  3. A ball is projected upwards from the foot of a tower. The ball crosses the top
  4. A bar magnet of pole strength 10 A-m is cut into two equal parts breadthwise.
  5. Three resistances 2Ω, 3Ω and 4Ω are connected in parallel. The ratio of currents passing