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  1. An artificial satellite is revolving round the earth in a circular orbit. Its velocity
  2. A transformer of 100% efficiency has 200 turns in the primary coil and 40000 turns
  3. If the velocity of an electron increases, then its de Broglie wavelength will
  4. The flux linked with a coil at any intant t is given by ?=10t² – 50t + 250
  5. A common emitter amplifier has a voltage gain of 50, an input impedance of 100Ω