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  • Question

  • A 200 turn coil has a self inductance of 10 mH. If the number of turns is doubled, all other quantities remaining the same, the self inductance will be


  • Options
  • A. 2.5 mH
  • B. 5 mH
  • C. 20 mH
  • D. 40 mH

  • Correct Answer
  • 40 mH 

    Explanation
    Inductance is proportional to square of number of turns.

    Materials and Components problems

    Search Results

    • 1. The field pattern of a solenoid is similar to that of bar magnet.

    • Options
    • A. True
    • B. False
      • Discuss
    • 2. A material which is lightly repelled by a magnetic field is known as

    • Options
    • A. diamagnetic material
    • B. non-magnetic material
    • C. ferromagnetic material
    • D. paramagnetic material
      • Discuss
    • 3. The relationship of hysteresis loss to maximum flux density was first determined by

    • Options
    • A. C. Steinmetz
    • B. G.R. Kirchoff
    • C. Mr. Laplace
    • D. Mr. Ampere
      • Discuss
    • 4. The heat developed per m3 per second (W) in a conductor having a conductivity ? and a field E is

    • Options
    • A. W = ?E2
    • B. W = ?E
    • C. W =
    • D. W = (?E)0.5
      • Discuss
    • 5. Ferromagnetic materials

    • Options
    • A. shows spontaneous magnetisation below a certain temperature
    • B. have resistivity very high as compared to that of iron
    • C. can be used even at microwave frequencies
    • D. all of the above
      • Discuss
    • 6. In a specimen of ferromagnetic material, as the flux density is increased from zero to 2.5 T, µr will

    • Options
    • A. increase
    • B. decrease
    • C. first decrease then increase
    • D. first increase then decrease
      • Discuss
    • 7. The number of valence electrons in acceptor impurity are

    • Options
    • A. 5
    • B. 4
    • C. 3
    • D. 1
      • Discuss
    • 8. Ferrites have

    • Options
    • A. a low copper loss
    • B. low eddy current loss
    • C. low resistivity
    • D. higher specific gravity compared to iron
      • Discuss
    • 9. A permeable substance is one

    • Options
    • A. which is strong magnet
    • B. which is a weak magnet
    • C. which is a good conductor
    • D. through which magnetic lines of force can pass easily
      • Discuss
    • 10. Which of the following is the poorest conductor of electricity?

    • Options
    • A. Aluminium
    • B. Nichrome
    • C. Copper
    • D. All of the above
      • Discuss

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