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Electromagnetic Induction — Physics STD 12 Science — Question

Bihar BoardEnglish MediumSTD 12 SciencePhysicsElectromagnetic Induction1 Mark
MCQ
When a coil is moved or rotated relative a fixed magnet then.
  • A
    voltage increased
  • B
    current is induced
  • C
    both
  • D
    voltage is induced
✓

Answer

  1. current is induced

Explanation:

After performing a large number of experiments, Faraday and Henry made the following observations about electromagnetic induction 

  1. a current is induced in a coil when it is moved(rotated)relative to a fixed magnet.
  2. a current is also induced in a fixed coil when a magnet is moved (or rotated)relative to the fixed coil.
  3. no current is induced in a coil when the coil and magnet both are stationary relative to one another. 
  4. when the direction of motion of coil (or magnet) is reversed , the direction of current induced in the coil also get reversed. 
  5. the magnitude of current induced in the coil can be increased.
  1. by winding the coil on a soft iron core.
  2. by increasing the number of turns in the coil.
  3. by increasing the strength of magnet.
  4. by increasing the speed of rotation of coil (magnet).

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