logo

CuriousTab

CuriousTab

Discussion

Home ‣ Electronics and Communication Engineering ‣ Materials and Components Comments
  • Question

  • The electric dipole moment of a neutral system of point charges Q1, Q2.... is The electric dipole moment of a neutral system of point charges Q1, Q2.... is Qiri . The charges Qi Qiri . The charges Qi


  • Options
  • A. must be all positive
  • B. must be all negative
  • C. must be such that The electric dipole moment of a neutral system of point charges Q1, Q2.... is Qiri . The charges Qi Qi = 0
  • D. either (a) or (b)

  • Correct Answer
  • must be such that Qi = 0 

    Explanation
    The system is neutral and hence sum is zero.

    Materials and Components problems

    Search Results

    • 1. The resistivity of intrinsic semiconductors, at room temperature, is of the order of

    • Options
    • A. 1 ?-m
    • B. 1000 ?-m
    • C. 106 ?-m
    • D. 10-3 ?-m
      • Discuss
    • 2. A material has N spins per m3. If Np are the dipoles per m3 parallel to field and Na are the dipoles per m3 anti-parallel to field, the magnetisation is

    • Options
    • A.
    • B.
    • C.
    • D.
      • Discuss
    • 3. For a multiplate capacitor having n plates, A as area of each plate, the capacitance is proportional to

    • Options
    • A. n A
    • B. (n - 1) A
    • C. (n + 1) A
    • D.
      • Discuss
    • 4. At a temperature of about 1 K, aluminium is a

    • Options
    • A. conductor
    • B. insulator
    • C. photoconductor
    • D. superconductor
      • Discuss
    • 5. The circumference of an electron orbit is equal to integer times the wavelength of electron.

    • Options
    • A. True
    • B. False
      • Discuss
    • 6. If m, v, r are the mass, velocity and radius of orbit of electron and h is Planck's constant, quantum condition for electron's orbit is

    • Options
    • A.
    • B.
    • C.
    • D.
      • Discuss
    • 7. The capacitance of an insulated conducting sphere of radius R in vacuum is

    • Options
    • A. 2p?0R
    • B. 4p?0R
    • C. 4p?0R2
    • D. 4p
      • Discuss
    • 8. Thermistor is used in

    • Options
    • A. temperature measurement
    • B. temperature control
    • C. high temperature alarm circuits of devices
    • D. all of the above
      • Discuss
    • 9. The hysteresis loss is

    • Options
    • A. proportional to frequency
    • B. independent of frequency
    • C. proportional to (frequency)2
    • D. proportional to
      • Discuss
    • 10. Resistivity of rubber is about

    • Options
    • A. 102 ?-m
    • B. 10-2 ?-m
    • C. 5 x 108 ? m
    • D. 5 x 1012 ?-m
      • Discuss

    Comments

    There are no comments.
Enter a new Comment




Aptitude

Engineering

Programming

Reasoning

Links

Copyright ©CuriousTab. All rights reserved.