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  1. Sound production from tape recorder makes use of
  2. A circuit contains an ammeter, a battery of 30 V and a resistance 40.8 ohm
  3. The value of n so that vectors 2i+3j-2k, 5i+nj+k and -i+2j+3k may be coplanar,will be
  4. The reddish appearance of the sun at sunrise and sunset is due to
  5. A,B and C are voltmeters of resistance R, 1.5 R and 3R respectively, as shown