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  • Question

  • The Ohm's law for conduction in metals is


  • Options
  • A. J = ?E
  • B. J = The Ohm's law for conduction in metals is J = ?E J = J ? ?E J ?
  • C. J ? ?E
  • D. J ? The Ohm's law for conduction in metals is J = ?E J = J ? ?E J ?

  • Correct Answer
  • J = ?E 

    • Materials and Components problems

    Search Results

    • 1. The v-i characteristic shown in the given figure is for

    • Options
    • A. thermistor
    • B. photoconductor
    • C. varistor
    • D. none of the above
      • Discuss
    • 2. Which of the following is used in temperature alarm circuits?

    • Options
    • A. Thermistor
    • B. Photoconductor
    • C. Transistor
    • D. Varistor
      • Discuss
    • 3. A parallel plate capacitor has area of plate equal to 1 m and distance between plates is also 1 m2. The lossy dielectric has a complex dielectric constant ?r = ?'r - j ?"r. If the capacitor is represented by R and C is parallel, then

    • Options
    • A.
    • B.
    • C.
    • D.
      • Discuss
    • 4. M = (?r - 1)H.

    • Options
    • A. True
    • B. False
      • Discuss
    • 5. A rare gas has N atoms per m3. If electronic polarizability of single atom of this gas is ae, then

    • Options
    • A. ?r = Nae
    • B. ?0?r = Nae
    • C. ?0(?r - 1) = Nae
    • D. ?0(?r - 2) = Nae
      • Discuss
    • 6. Soft iron is suitable for making temporary magnets.

    • Options
    • A. True
    • B. False
      • Discuss
    • 7. A specimen of metal has n valence electrons per m3. If vx is the average velocity of these electrons, each having a charge e, the current density J is

    • Options
    • A. J = ne vx
    • B. J = - ne vx
    • C. J =
    • D. J =
      • Discuss
    • 8. A metal has a large number of free electrons. If e is electronic charge and m is mass of electron and an electric field E is applied along (say) x direction, the electrons acquire a velocity having a component vx is x direction. Then

    • Options
    • A.
    • B.
    • C.
    • D.
      • Discuss
    • 9. If the operating temperature increases by 10°C, the rate of deterioration of solid dielectric becomes

    • Options
    • A. double
    • B. one and a half time
    • C. 3 times
    • D. 4 times
      • Discuss
    • 10. The measurement of Hall coefficient of a semiconductor with one type of charge carriers gives the information about

    • Options
    • A. sign of charge carrier
    • B. density of charge carrier
    • C. both sign and density of charge carrier
    • D. none of the above
      • Discuss

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