logo

CuriousTab

CuriousTab

Discussion

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

  • If q is charge on an electron, R is radius of electron orbit and ? is angular velocity of electron rotation, the magnetic dipole moment of electron in orbit is


  • Options
  • A. 0.5 q?R
  • B. 0.5 q2?2R2
  • C. 0.5 q?R2
  • D. 0.5 q?2R

  • Correct Answer
  • 0.5 q?R2 

    • Materials and Components problems

    Search Results

    • 1. Assertion (A): Copper is a monoatomic solid.

      Reason (R): In a metal the valence electrons belong to all atoms.


    • Options
    • A. Both A and R are true and R is correct explanation of A
    • B. Both A and R are true but R is not correct explanation of A
    • C. A is true but R is false
    • D. A is false but R is true
      • Discuss
    • 2. Paramagnetic materials have permanent magnetic dipoles but interaction between neighbouring dipoles is negligible.

    • Options
    • A. True
    • B. False
      • Discuss
    • 3. Assertion (A): CO2 has no resultant dipole moment but CO has a dipole moment.

      Reason (R): The structure of CO2 is O = C = O.


    • Options
    • A. Both A and R are true and R is correct explanation of A
    • B. Both A and R are true but R is not correct explanation of A
    • C. A is true but R is false
    • D. A is false but R is true
      • Discuss
    • 4. Assertion (A): Relaxation time and mean time between collisions are equal when scattering is isotropic.

      Reason (R): Mean free path of an electron ?, velocity of electron v and mean time between collisions tc are related as ? = vTc.


    • Options
    • A. Both A and R are true and R is correct explanation of A
    • B. Both A and R are true but R is not correct explanation of A
    • C. A is true but R is false
    • D. A is false but R is true
      • Discuss
    • 5. When subjected to alternating stresses, an insulating material is characterised by complex dielectric constant ?'r - j?"r . In such materials, the dielectric losses under alternating stress is proportional

    • Options
    • A. ?"r
    • B. both ?'r and ?"r
    • C. ?'r
    • D. (?"r)2
      • Discuss
    • 6. The classes of solid dielectrics are

    • Options
    • A. A, B, C, D, E, F, H
    • B. A E B F H C D
    • C. Y A E B F H C
    • D. A E B F H C
      • Discuss
    • 7. For a photoconductor with equal electron and hole mobilities and perfect ohmic contacts at the ends, an increase in intensity of optical illumination results in

    • Options
    • A. a change in o.c voltage
    • B. a change in s.c current
    • C. decrease in resistance
    • D. increase in resistance
      • Discuss
    • 8. Assertion (A): If WF is Fermi energy, v is velocity of electron and m is mass of electron, then .

      Reason (R): Conductivity of a metal depends on temperature and impurity concentration.


    • Options
    • A. Both A and R are true and R is correct explanation of A
    • B. Both A and R are true but R is not correct explanation of A
    • C. A is true but R is false
    • D. A is false but R is true
      • Discuss
    • 9. The temperature below which certain materials are antiferromagnetic and above which they are paramagnetic is called

    • Options
    • A. Weiss temperature
    • B. Curie temperature
    • C. Neel temperature
    • D. None of the above
      • Discuss
    • 10. Assertion (A): When cathode temperature is increased from 2500 K to 2550 K, thermionic emission current may increase by about 50%.

      Reason (R): Thermionic emission current ? T2 e-Ew/kT.


    • Options
    • A. Both A and R are true and R is correct explanation of A
    • B. Both A and R are true but R is not correct explanation of A
    • C. A is true but R is false
    • D. A is false but R is true
      • Discuss

    Comments

    There are no comments.
Enter a new Comment




Aptitude

Engineering

Programming

Reasoning

Links

Copyright ©CuriousTab. All rights reserved.