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      Charge densities in semiconductors
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      Difference between Insulators, Semiconductors and Conductors
      Mobility and conductivity
      Intrinsic and extrensic semiconductors
      Fermi level in semi conductors
      Charge densities in semiconductors
      Mass action law
      Drift and diffusion currents
      Continuty equation
      Injected minority charge carriers
      Hall effect
      P-N junction diode
      Rectifier: Half wave and Full wave
      Bridge recitifer
      Zenor diode
      Varactor diode
      Schotty diode and its applications
      Regulated power supply using zenor diode
      Photodetectos