Discussion
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- Question
What are the effects of moving a closed wire loop through a magnetic field?
Options- A. A voltage is induced in the wire.
- B. A current is induced in the wire.
- C. The polarity across the wire depends on the direction of motion.
- D. All of the above
- Correct Answer
- All of the above
- 1. The Hall effect
Options- A. is a phenomenon with no practical applications
- B. is used in various sensor applications
- C. can develop potentials of thousands of volts
- D. is the basis for solar cell operation Discuss
- 2. Which electromagnetic device uses brushes and a commutator?
Options- A. A speaker
- B. A dc generator
- C. A relay
- D. A solenoid Discuss
- 3. What is the flux density of a magnetic field whose flux is 3000 µWb and cross-sectional area is 0.25 m2?
Options- A. 12,000 µT
- B. 83,330 T
- C. 0 T
- D. More information is needed in order to find flux density. Discuss
- 4. What is the reluctance of a material that has a length of 0.045 m, a cross-sectional area of 0.015 m2, and a permeability of 2500 µWb/At·m?
Options- A. 833.33 µAt/Wb
- B. 0.27 At/Wb
- C. 1200 At/Wb
- D. More information is needed in order to find the reluctance. Discuss
- 5. A Hall effect sensor
Options- A. exists only in theory
- B. is a noncontacting magnetic sensor
- C. can operate only a few times before failure
- D. produces very large voltages Discuss
- 6. Which electromagnetic device has a movable iron core called a plunger?
Options- A. A speaker
- B. A dc generator
- C. A relay
- D. A solenoid Discuss
- 7. Which electromagnetic device has a flexible cone?
Options- A. A speaker
- B. A dc generator
- C. A relay
- D. A solenoid Discuss
- 8. What is the magnetomotive force in a 150-turn coil of wire with 2 A flowing through it?
Options- A. 13.33 mAt
- B. 300 At
- C. 75 At
- D. 152 At Discuss
- 9. What do you call the characteristic of a magnetic material whereby a change in magnetization lags the application of a magnetizing force?
Options- A. Hysteresis
- B. Induction
- C. Retentivity
- D. Reluctance Discuss
- 10. The unit of flux density is known as
Options- A. magnetomotive force
- B. a weber
- C. a maxwell
- D. a tesla Discuss
Magnetism and Electromagnetism problems
Search Results
Correct Answer: is used in various sensor applications
Correct Answer: A dc generator
Correct Answer: 12,000 µT
Correct Answer: 1200 At/Wb
Correct Answer: is a noncontacting magnetic sensor
Correct Answer: A solenoid
Correct Answer: A speaker
Correct Answer: 300 At
Correct Answer: Hysteresis
Correct Answer: a tesla
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