Discussion
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- Question
An electron is moving around a proton, in a circle of radius R. If flux density in the region is increased from zero to B, the force on the electron is
Options- A.
- B. eR (dB / dt)
- C. eRB
- D.
- Correct Answer
-
- 1. Nickel is a non-magnetic material.
Options- A. True
- B. False Discuss
- 2. When a material is in superconducting state and a magnetic field is applied
Options- A. the superconducting property is not affected
- B. the superconducting property may be affected and resistivity may increase from zero to a low value
- C. the superconducting property may be destroyed
- D. the material may become an insulator Discuss
- 3. The induced magnetic dipole moment is independent of the permanent magnetic dipole moment.
Options- A. True
- B. False Discuss
- 4. In terms of Planck's constant h, the orbital angular momentum of an electron is
Options- A. h
- B.
- C. 2ph
- D.
Discuss
- 5. Assertion (A): Hall effect is used to determine whether the semi- conductor is p or n type.
Reason (R): Under the influence of field, holes and electrons move in opposite direction.
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
- 6. A copper specimen has resistivity equal to 1.8 x 10-8 ohm-m at room temperature. At a temperature of 700 K, the resistivity is likely to be
Options- A. 1.6 x 10-8 ?-m
- B. 2 x 10-8 ?-m
- C. 3 x 10-8 ?-m
- D. 6 x 10-8 ?-m Discuss
- 7. The number of protons in a silicon atom are
Options- A. 4
- B. 8
- C. 12
- D. 14 Discuss
- 8. A rare gas having N atoms/m3 is subjected to an electric field E. The electric dipole moment per unit volume is proportional to N and E.
Options- A. True
- B. False Discuss
- 9. As the atoms of rare gases become larger, electronic polarizability
Options- A. increases
- B. decreases
- C. remains the same
- D. may increase or decrease Discuss
- 10. Carbon steel has a residual flux density of 1 Wb/m2.
Options- A. True
- B. False Discuss
Materials and Components problems
Search Results
Correct Answer: False
Explanation:
Nickel is ferromagnetic material.
Correct Answer: the superconducting property may be destroyed
Correct Answer: True
Correct Answer:
Correct Answer: Both A and R are true and R is correct explanation of A
Correct Answer: 6 x 10-8 ?-m
Correct Answer: 14
Correct Answer: True
Correct Answer: remains the same
Correct Answer: True
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