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  1. A step-up transformer operates on a 230 V line and supplies a current of 2 A.
  2. In an astronomical telescope in normal adjustment a straight black line of length
  3. Magnetism of a magnet is due to
  4. The photoelectric threshold frequency of a metal is ν. When light of frequency 4ν
  5. An electron moving in a circular orbit of radius r makes n rotations per second.