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  1. Core of electromagnets are made of ferromagnetic material which has
  2. Pure Si at 300 k has equal electrons (nₑ) and hole (nh) concentrations
  3. A linear aperture whose width is 0.02 cm is placed immediately in front of a lens
  4. The Davisson- Germer experiment is the direct evidence of
  5. Which of the following is or the property of a cathode ray