Discussion
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- Question
If ?r = ?r' - j?r" tan ? =
.
Options- A. True
- B. False
- Correct Answer
- True
- 1. In Fermi-Dirac statistics, the probability of electron occupation of an energy level equal to Fermi level is
Options- A. 0
- B. 0.25
- C. 0.5
- D. 1 Discuss
- 2. The resistance of a superconductor is
Options- A. low
- B. very low
- C. very very low
- D. zero Discuss
- 3. The application of magnetic field to superconducting material
Options- A. increases transition temperature
- B. decreases transition temperature
- C. has no effect on transition temperature
- D. may increase or decrease the transition temperature Discuss
- 4. As per Curie-Weiss law, the magnetic susceptibility of a material varies as
Options- A. T-2
- B.
- C. T
- D. T2 Discuss
- 5. For a superconductor, magnetisation M in a field H is
Options- A. extremely small
- B. - H
- C. - I
- D. zero Discuss
- 6. The maximum temperature limit of class B insulation is
Options- A. 90°C
- B. 105°C
- C. 120°C
- D. 130°C Discuss
- 7. Resistivity of metals consists of two parts, one part constant and the other temperature dependent.
Options- A. True
- B. False Discuss
- 8. Assertion (A): The regular or irregular stacking of atoms has importanteffect on properties of materials.
Reason (R): The arrangement of atoms in a given material can be studied using X-rays.
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. Assertion (A): Both sodium and ferrous are ferromagnetic.
Reason (R): Both sodium and ferrous have body centred cubic structure.
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
- 10. Assertion (A): ?0 has the dimensions of farad per meter.
Reason (R): D = ?0?r E.
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
Materials and Components problems
Search Results
Correct Answer: 0.5
Correct Answer: zero
Correct Answer: decreases transition temperature
Correct Answer:
Correct Answer: - H
Correct Answer: 130°C
Correct Answer: True
Correct Answer: Both A and R are true but R is not correct explanation of A
Correct Answer: Both A and R are true but R is not correct explanation of A
Correct Answer: Both A and R are true but R is not correct explanation of A
Explanation:
The dimensions of ?0 can be derived from the expression D = ?0?r E.
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