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- Question
Hysteresis is the number of lines of force per unit area in a magnetic field.
Options- A. True
- B. False
- Correct Answer
- False
- 1. Materials with a low retentivity do not retain a magnetic field very well.
Options- A. True
- B. False Discuss
- 2. The tesla is the unit of magnetic flux.
Options- A. True
- B. False Discuss
- 3. Ampere-turn is the unit of magnetomotive force (mmf).
Options- A. True
- B. False Discuss
- 4. If a conductor is moved back and forth at a constant rate in a constant magnetic field, the voltage in the conductor will reverse polarity.
Options- A. True
- B. False Discuss
- 5. A relay is an electromagnetically controlled mechanical device in which electrical contacts are opened or closed by a magnetizing current.
Options- A. True
- B. False Discuss
- 6. Lenz's law defines the polarity of the induced voltage.
Options- A. True
- B. False Discuss
- 7. A magnetic field is made up of flux lines.
Options- A. True
- B. False Discuss
- 8. Reluctance in a magnetic circuit is analogous to current in an electrical circuit.
Options- A. True
- B. False Discuss
- 9. Electromagnetic induction is the force that produces a magnetic field.
Options- A. True
- B. False Discuss
- 10. Voltage leads current by 90° in a capacitor.
Options- A. True
- B. False Discuss
Magnetism and Electromagnetism problems
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