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  1. A spring when stretched by 2mm containing energy 4 J. If it is stretched
  2. A planar coil having 12 turns carries 15 A current. The coil is oriented with respect
  3. An α-particle of energy 5 MeV is scattered through 180⁰ by a fixed uranium nucleus.
  4. An electric charge 10⁻³ μC is placed at the origin (0,0) of X-Y co-ordinate system.
  5. The Davisson- Germer experiment is the direct evidence of