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  1. A shell of mass 200 g is ejected from a gun of mass 4 kg by an explosion
  2. When one of the slits of Young’s experiment is covered with a transport sheet
  3. If the force exerted by an electric dipole on a charge q at a distance of 1 m is F
  4. Charge Q is divided into two parts which are then kept some distance apart. The force
  5. A point source is kept at a distnace 1000m has an illumination I. To change the illumination