Magnetism and Electrom Questions and Answers
Magnetism and Electron Questions with Answers cover the essential principles of electromagnetism and electronic motion. These electronics MCQs are frequently asked in exams like GATE, DRDO, and ISRO. Understanding the relationship between magnetic fields and electron behavior is vital for mastering electronics and electrical engineering fundamentals. Practicing these technical questions strengthens your analytical and conceptual knowledge required for both academic success and interviews. Explore our collection of electronics programming questions and answers with detailed explanations to prepare efficiently for upcoming technical tests.
Magnetism and Electrom
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33 questions
11. Which electromagnetic device has a flexible cone?
- A speaker
- A dc generator
- A relay
- A solenoid
12. 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?
- 833.33 µAt/Wb
- 0.27 At/Wb
- 1200 At/Wb
- More information is needed in order to find the reluctance.
13. The unit of flux density is known as
- magnetomotive force
- a weber
- a maxwell
- a tesla
14. What do you call the characteristic of a magnetic material whereby a change in magnetization lags the application of a magnetizing force?
- Hysteresis
- Induction
- Retentivity
- Reluctance
15. Which electromagnetic device has a movable iron core called a plunger?
- A speaker
- A dc generator
- A relay
- A solenoid
16. Which electromagnetic device contains an armature?
- A speaker
- A dc generator
- A relay
- A solenoid
17. The polarity of induced voltage while a field is collapsing is
- independent of the force creating the field
- opposite to the force creating the field
- identical to the force creating the field
- present only if the force is stationary
19. The ability of a material to maintain a magnetized state (without the presence of a magnetizing force) is called retentivity.
- TRUE
- FALSE
20. Magnetic flux flows from the north pole to the south pole within the magnet.
- TRUE
- FALSE