Discussion
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- Question
For a diamagnetic material, ?r = 1.
Options- A. True
- B. False
- Correct Answer
- True
- 1. Yettrium-iron garnet (Y2Fe5O12) is a soft magnetic material suitable for applications involving
Options- A. dc
- B. 50 Hz ac
- C. ac of a few K Hz
- D. ac of a few hundred MHz Discuss
- 2. With increase in temperature, the electrical conductivity would
Options- A. increase in metals as well as in intrinsic semiconductor
- B. increase in metals but decrease in intrinsic semiconductor
- C. decrease in metals but increase in intrinsic semiconductor
- D. decrease in metals as well as in intrinsic semiconductor Discuss
- 3. Hall effect is observed in a specimen (metal or semi- conductor) when it is carrying current and is placed in a magnetic field. The resultant electric field inside the specimen is
Options- A. normal to both current and magnetic field
- B. in the same direction as current
- C. in a direction anti parallel to magnetic field
- D. none of the above Discuss
- 4. The capacitance of a capacitor is not affected by
Options- A. area of plates
- B. thickness of plates
- C. ?r
- D. distance between plates Discuss
- 5. The charge per proton is
Options- A. 1.6 x 10-19 C
- B. 2.6 x 10-19 C
- C. 0.6 x 10-19 C
- D. 1.6 x 10-13 C Discuss
- 6. An electron for which l = 0 has zero orbital magnetic dipole moment.
Options- A. True
- B. False Discuss
- 7. A magnetic field exists around
Options- A. moving charges
- B. static charges
- C. iron
- D. copper Discuss
- 8. The resistance of a photoconductor
Options- A. increases with increase in light intensity
- B. decreases with increase in light intensity
- C. may increase or decrease with increase in light intensity
- D. remains constant Discuss
- 9. The resistance of a metallic wire would
Options- A. increase as f increase
- B. decrease as f increase
- C. remains the same at all frequencies
- D. increase with f up to a certain frequency and then decrease Discuss
- 10. Ferrimagnetic materials have anti-parallel orientation of equal moments of permanent dipoles.
Options- A. True
- B. False Discuss
Materials and Components problems
Search Results
Correct Answer: dc
Explanation:
Yettrium iron garnet has very low eddy current loss. Hence it is used at frequencies in MHz range.
Correct Answer: decrease in metals but increase in intrinsic semiconductor
Explanation:
Increase in temperature causes resistivity of metals to increase and resistivity of intrinsic semiconductors to decrease.
Conductivity is reciprocal of resistivity.
Correct Answer: normal to both current and magnetic field
Correct Answer: thickness of plates
Explanation:
Capacitance depends on area, distance and ?r but not on thickness of plates.
Correct Answer: 1.6 x 10-19 C
Explanation:
Because charge on proton is positive but numerically equal to that on electron.
Correct Answer: True
Correct Answer: moving charges
Correct Answer: decreases with increase in light intensity
Correct Answer: increase as f increase
Explanation:
As increases the resistance increases due to skin effect.
Correct Answer: True
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