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  1. A hollow metal sphere of radius 10 cm is charged such that the potential on its surface
  2. In cyclotron, for a given magnet, radius of the semicircle traced by positive ion
  3. A thin ring of radius R meter has charge q coulomb uniformly spread on it
  4. If an electron in a hydrogen atom jumps from the 3rd orbit to the 2nd orbit, it emits
  5. The potential energy of a long spring when stretched by 2 cm is U.