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  1. A parallel beam of fast moving electrons is incident normally on a narrow slit.
  2. A certain current on passing through a galvanometer produces a deflection
  3. A neutron moving with velocity v collides with a stationary particle
  4. The net electric force on a charge of +3μC at the mid-point on the line joining two
  5. The magnifying power of the astronomical telescope for normal adjustment is 50.