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  • Question

  • Two coaxial metallic cylinders have radii R1 and R2. The space between them is filled with a dielectric having dielectric constant ?r. The capacitance per metre length is


  • Options
  • A. Two coaxial metallic cylinders have radii R1 and R2. The space between them is filled with a dielect
  • B. Two coaxial metallic cylinders have radii R1 and R2. The space between them is filled with a dielect
  • C. Two coaxial metallic cylinders have radii R1 and R2. The space between them is filled with a dielect
  • D. Two coaxial metallic cylinders have radii R1 and R2. The space between them is filled with a dielect

  • Correct Answer
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    • Materials and Components problems

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    • 1. At 0 K, silicon and germanium behave like monoatomic crystals.

    • Options
    • A. True
    • B. False
      • Discuss
    • 2. A magnet does not attract

    • Options
    • A. nickel
    • B. iron
    • C. copper
    • D. iron and copper
      • Discuss
    • 3. The number of protons in germanium atom is

    • Options
    • A. 4
    • B. 16
    • C. 28
    • D. 32
      • Discuss
    • 4. Tesla is a unit of

    • Options
    • A. flux
    • B. field strength
    • C. flux density
    • D. MMF
      • Discuss
    • 5. The colour code on a carbon resistor is brown-black-red-gold. The value of resistance is

    • Options
    • A. 100 ?
    • B. 1000 ?
    • C. 1000 ? ± 5%
    • D. 1000 ? ± 10%
      • Discuss
    • 6. Hysteresis curve is associated with motion of domain walls.

    • Options
    • A. True
    • B. False
      • Discuss
    • 7. The induced magnetic dipole moment has a direction opposite to the applied magnetic field.

    • Options
    • A. True
    • B. False
      • Discuss
    • 8. A sample of N type semiconductor has an electron density of 6.25 x 1018/cm3 at 300 K. If intrinsic concentration of carriers in this sample is 2.5 x 1013/cm3 at this temperature, the hole density is

    • Options
    • A. 106 / cm3
    • B. 108 / cm3
    • C. 1010 / cm3
    • D. 1012 / cm3
      • Discuss
    • 9. When an electron moves at velocity v in combined electric and magnetic fields E and H, the Lorentz force F is F = - e(E + v x B).

    • Options
    • A. True
    • B. False
      • Discuss
    • 10. Iron has a body centred cubic structure.

    • Options
    • A. True
    • B. False
      • Discuss

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