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  1. When the rate of flow of charge through a metallic conductor
  2. A Galilean telescope has an objective of focal length 100 cm and magnifying power 50
  3. A thin film of soap solution (n=1.4) lies on the top of a glass plate (n=1.5).
  4. A man weighing 60 kg climbs a staircase carrying a 20 kg load on his hand
  5. A train of mass 2x 10⁵ kg has a constant speed of 20 m/s up a hill inclined