electromagnetism

• a solenoid is conductor with a lot wire turns

  Solenoid
• a conductor/solenoid with a few turns or only a singe turn

  COIL
• the magnitude of the induced emf across the ends of a conductor is directly proportional to the rate of charge in the magnetic flux linkage with the conductor


  faraday's Law
• the product of the perpendicular components of the magnetic across-sectional area are field lines pass through 


  magnetic flux