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  • Question

  • If e is the charge of an electron, R is the radius of its orbit and ? is the angular velocity of electron, the magnetic dipole moment ?m of the orbit is |?m| = e?R2.


  • Options
  • A. True
  • B. False

  • Correct Answer
  • False 

    Explanation
    1 ?m 1 = 0.5 e?r2.

    Materials and Components problems

    Search Results

    • 1. Material which lack permanent magnetic dipoles are known as

    • Options
    • A. paramagnetic
    • B. diamagnetic
    • C. ferromagnetic
    • D. ferrimagnetic
      • Discuss
    • 2. The conductivity of intrinsic semiconductor is given by

    • Options
    • A. eni(?p - ?n)
    • B. eni(?p + ?n)
    • C. ni(?p + ?n)
    • D. ni(?p?n)
      • Discuss
    • 3. Above ferroelectric curie temperature, spontaneous polarization in ferroelectric materials becomes stronger.

    • Options
    • A. True
    • B. False
      • Discuss
    • 4. If n denotes principal quantum number, the angular quantum number l = 0, 1... (n - 1).

    • Options
    • A. True
    • B. False
      • Discuss
    • 5. For a permanent magnetic material

    • Options
    • A. the residual induction and coercive field should be large
    • B. the residual induction and coercive field should be small
    • C. area of hysteresis loop should be small
    • D. initial relative permeability should be high
      • Discuss
    • 6. A parallel plate capacitor has its length, width and separation doubled. It fringing effects are neglected, to keep the capacitance same, the dielectric constant must be

    • Options
    • A. halved
    • B. kept the same
    • C. doubled
    • D. made 4 times
      • Discuss
    • 7. Hydrogen is used in

    • Options
    • A. large size transformers
    • B. MCB
    • C. large size generators
    • D. circuit breakers
      • Discuss

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