Discussion
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- Question
A circular sphere mile is the area of cross-section of a wire
Options- A. having a diameter equal to 1 miles
- B. having a radius equal to 1 miles
- C. having a circumference equal to 1 miles
- D. none of the above
- Correct Answer
- having a diameter equal to 1 miles
- 1. The dielectrics having only one kind of atoms are known as elemental dielectrics.
Options- A. True
- B. False Discuss
- 2. An electron (charge -e) is rotating in a circular orbit of radius R, around a proton with charge +e at a constant angular velocity ?. The orbital magnetic dipole moment is
Options- A. 0.5 e? R2
- B. e? R2
- C. 2 e? R2
- D. 0.5 e? R3 Discuss
- 3. Electric dipole moment is usually expressed in debye units. Here, 1 debye unit equals
Options- A. 3.33 x 10-30 C-m
- B. 3.33 x 10-30 C-m2
- C. 3.30 x 10-10 C-m
- D. 3.33 x 10-10 C-m2 Discuss
- 4. The number of tightly bound electrons in silicon atom are
Options- A. 14
- B. 10
- C. 6
- D. 4 Discuss
- 5. A dielectric is subjected to alternating field. The dielectric losses are potential to
Options- A. real part of dielectric constant
- B. imaginary part of dielectric constant
- C. both real and imaginary parts of dielectric constant
- D. either real or imaginary part of dielectric constant Discuss
- 6. 1 Bohr magneton =
.
Options- A. True
- B. False Discuss
- 7. Which of the following is used in lightning arresters?
Options- A. Thermistor
- B. Photoconductor
- C. Transistor
- D. Varistor Discuss
- 8. In its lowest state, the electron is bound to the field of proton by an energy equal to
Options- A. 100.5 eV
- B. 51.2 eV
- C. 13.6 eV
- D. 0.2 eV Discuss
- 9. As regards ferromagnetic Curie temperature Qf and paramagnetic curie temperature ?
Options- A. Qf > ?
- B. ? > Qf
- C. ? equal to or less than Qf
- D. ? may be equal to less than or more Qf Discuss
- 10. In a ferromagnetic material, the internal field seen by a dipole is
Options- A. equal to applied field
- B. equal to applied field minus a contribution from neighbouring dipoles
- C. equal to applied field plus a contribution from neighbouring dipoles
- D. equal to or less than applied field Discuss
Materials and Components problems
Search Results
Correct Answer: True
Correct Answer: 0.5 e? R2
Correct Answer: 3.33 x 10-30 C-m
Correct Answer: 10
Explanation:
Silicon has 14 electons and 4 valence electrons. The 10 electrons in the inner orbits are tightly bound.
Correct Answer: imaginary part of dielectric constant
Explanation:
Absorption of energy is proportional to imaginary part of complex dielectric constant.
Correct Answer: True
Correct Answer: Varistor
Correct Answer: 13.6 eV
Explanation:
13.6 eV is required to ionize hydrogen atom.
Correct Answer: ? > Qf
Correct Answer: equal to applied field plus a contribution from neighbouring dipoles
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