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  1. Two cells, having the same e.m.f. are connected in series through an external resistance
  2. A particle moving in a straight line with uniform acceleration is observed
  3. A radioactive substance has a half-life of four months. Three-fourth of substance
  4. A body of mass 2 kg is kept by pressing to a vertical wall by a force of 100 N
  5. The electron of a hydrogen atom revolves round the proton in a circular