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  1. The effective length of magnet is 31.4 cm and its pole strength is 0.8Am.
  2. A coil of 40 henry inductance is connected in series with a resistance of 8 ohm
  3. A Carnot engine, having an efficiency of η=1/10 as heat engine, is used
  4. A rocket with a lift-off mass 3.5 x 10⁴ kg is blasted upwards with an initial acceleration
  5. Four identical cells of emf Ԑ and internal resistance r are to be connected in series.