Discussion
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- Question
The induced magnetic dipole moment has a direction opposite to the applied magnetic field.
Options- A. True
- B. False
- Correct Answer
- True
- 1. Hysteresis curve is associated with motion of domain walls.
Options- A. True
- B. False Discuss
- 2. 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.
- B.
- C.
- D.
Discuss
- 3. At 0 K, silicon and germanium behave like monoatomic crystals.
Options- A. True
- B. False Discuss
- 4. A magnet does not attract
Options- A. nickel
- B. iron
- C. copper
- D. iron and copper Discuss
- 5. The number of protons in germanium atom is
Options- A. 4
- B. 16
- C. 28
- D. 32 Discuss
- 6. 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
- 7. 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
- 8. Iron has a body centred cubic structure.
Options- A. True
- B. False Discuss
- 9. Sulphur hexafluoride is used in
Options- A. transformers
- B. generators
- C. relays
- D. circuit breakers Discuss
- 10. 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
Materials and Components problems
Search Results
Correct Answer: True
Correct Answer:
Correct Answer: False
Correct Answer: copper
Explanation:
Only copper is non-magnetic.
Correct Answer: 32
Correct Answer: 108 / cm3
Correct Answer: True
Correct Answer: True
Correct Answer: circuit breakers
Explanation:
Sulphur hexafluoride is used in circuit breakers for arc quenching and insulation.
Correct Answer: ?0(?r - 1) = Nae
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