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  1. The magnetic susceptibility is negative for
  2. Three masses are placed on the x-axis : 300 g at origin, 500 g at x = 40 cm
  3. The polarising angle of glass is 57⁰. A ray of light which is incident at this angle
  4. A body travels 200 cm in the first two seconds and 220 cm in the next 4 secs
  5. A source is moving towards an observer with a speed of 20 m/s and having frequency