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  1. A body revolved around the sun 27 times faster than the earth. What is the ratio
  2. If the electric field lines is flowing along axis of a cylinder, then the flux
  3. The electron of a hydrogen atom revolves round the proton in a circular
  4. If an electron and a positron annihilate, the energy released is
  5. In a mass spectrometer used for measuring the masses of ions, the ions