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  1. Two electrons are separated by a distance of 1Å. What is the coulomb force between them?
  2. The excitation potential of hydrogen atom in the first excited state is
  3. The innermost orbit of hydrogen atom has a diameter 1.06Å. The diameter of tenth
  4. The apparent weight of the body of mass 10 kg when it is travelling upwards with
  5. When 4 A current flows for 2 min in an electroplating experiment,