Emf Moving Rod
Mediumphysics
Rod length L moving at speed v perpendicular to uniform B. Induced emf?
Select the correct option:
Solution
Incorrect! Answer:
B L v
- Motional EMF Concept: When a conductor moves through a magnetic field, the free charges inside it experience a Lorentz force (F=qvB), causing them to accumulate at the ends.
- Field Alignment: If the rod (length L), magnetic field (B), and velocity vector (v) are mutually perpendicular:
- Derivation: Potential difference V=E⋅L. At equilibrium, electric force qE=qvB⟹E=vB. Thus, V=vBL.
- Equation: ϵ=BLv.
- Usage: This is the basic principle behind power generation in various electromagnetic devices.
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About This Question
- Subject
- physics
- Chapter
- em induction and ac
- Topic
- emf moving rod
- Difficulty
- Medium
- Year
- 2025
Solution
Correct Answer:
B L v
- Motional EMF Concept: When a conductor moves through a magnetic field, the free charges inside it experience a Lorentz force (F=qvB), causing them to accumulate at the ends.
- Field Alignment: If the rod (length L), magnetic field (B), and velocity vector (v) are mutually perpendicular:
- Derivation: Potential difference V=E⋅L. At equilibrium, electric force qE=qvB⟹E=vB. Thus, V=vBL.
- Equation: ϵ=BLv.
- Usage: This is the basic principle behind power generation in various electromagnetic devices.
This medium difficulty physics question is from the chapter em induction and ac, covering the topic of emf moving rod. It appeared in the 2025 exam.
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