Field Long Straight Wire
Easyphysics
Magnetic field at distance r from long straight wire carrying current I?
Select the correct option:
Solution
Incorrect! Answer:
μ0 I /(2π r)
- Biot-Savart/Ampere's Law: For a long straight conductor, the magnetic field forms concentric circular loops around the wire.
- Ampere's Law Application: ∮B⋅dl=μ0I. For a circular path of radius r, B(2πr)=μ0I.
- Isolate B: B=2πrμ0I.
- Variables:
- μ0 is the permeability of free space (4π×10−7 T\cdotpm/A).
- I is the current and r is the radial distance from the wire.
- Direction: Determined by the Right-Hand Thumb Rule.
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About This Question
- Subject
- physics
- Chapter
- magnetic effects and magnetism
- Topic
- field long straight wire
- Difficulty
- Easy
- Year
- 2025
Solution
Correct Answer:
μ0 I /(2π r)
- Biot-Savart/Ampere's Law: For a long straight conductor, the magnetic field forms concentric circular loops around the wire.
- Ampere's Law Application: ∮B⋅dl=μ0I. For a circular path of radius r, B(2πr)=μ0I.
- Isolate B: B=2πrμ0I.
- Variables:
- μ0 is the permeability of free space (4π×10−7 T\cdotpm/A).
- I is the current and r is the radial distance from the wire.
- Direction: Determined by the Right-Hand Thumb Rule.
This easy difficulty physics question is from the chapter magnetic effects and magnetism, covering the topic of field long straight wire. It appeared in the 2025 exam.
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