Eddy Currents
Mediumphysics
Eddy currents are?
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Solution
Incorrect! Answer:
Localized circulating induced currents in conductors
- Origin: When a solid sheet or bulk piece of conductor is placed in a changing magnetic flux, emf is induced throughout the volume.
- Flow: Unlike wires, the current flows in closed circulating paths (like eddies in water) within the body of the conductor.
- Effects:
- Heating: Causes significant energy loss (Joule heating).
- Damping: Produces a braking effect by Lenz's Law (used in electromagnetic brakes).
- Reduction: Minimized by using laminated cores in transformers and motors to break the large current loops into smaller, high-resistance paths.
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About This Question
- Subject
- physics
- Chapter
- em induction and ac
- Topic
- eddy currents
- Difficulty
- Medium
- Year
- 2025
Solution
Correct Answer:
Localized circulating induced currents in conductors
- Origin: When a solid sheet or bulk piece of conductor is placed in a changing magnetic flux, emf is induced throughout the volume.
- Flow: Unlike wires, the current flows in closed circulating paths (like eddies in water) within the body of the conductor.
- Effects:
- Heating: Causes significant energy loss (Joule heating).
- Damping: Produces a braking effect by Lenz's Law (used in electromagnetic brakes).
- Reduction: Minimized by using laminated cores in transformers and motors to break the large current loops into smaller, high-resistance paths.
This medium difficulty physics question is from the chapter em induction and ac, covering the topic of eddy currents. It appeared in the 2025 exam.
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