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04
Jun

Electromagnetic Induction & Alternating Current Test15

Written by Administrator on 04 June 2013.

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Quick View of Questions:

  1. The expression for emf induced by changing the magnetic induction is _____.
  2. Lenz’s law is in according with law of conservation of _____.
  3. Unit of induced emf is _____.
  4. AC frequency of 100 kHz to 100 MHz is required for _____.
  5. The reactance of an inductor is _____.
  6. Total number of magnetic lines of force linked with the area of cross section of a coil is known as _____.
  7. In a three phase a.c. generator the number of coils used is _____.
  8. The coefficient of self-induction of a coil of 1000 turns which produces a magnetic flux of 0.5 Wb for a constant current of 2.5 A is _____.
  9. A wire of length 0.1 m moves with a speed of 10 ms-1 perpendicular to a magnetic field of induction 1 Wbm-2. The induced emf is _____.
  10. In which of the following formation, eddy current is not useful?

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