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  1. The identical cells connected in series are needed to heat a wire of length one meter
  2. If oxygen has root mean square velocity of C m/s, then root mean square velocity of H
  3. A moving coil galvanometer of resistance 100 Ω is converted to ammeter by a resistance
  4. A magnifying glass of focal length 5 cm is used to view an object by a person
  5. If a gymnast, sitting on a rotating stool with his arms outstretched, suddenly