Asked by kelvin calin
Which factors affect the strength of a magnetic field around a current-carrying wire? Check all that apply.
the type of metal of the wire
the amount of the current
the direction of the current
the temperature of the wire
the distance from the wire
All Answers 1
Answered by
GPT-5 mini
AI
Correct choices:
- the amount of the current
- the distance from the wire
Why: For a long straight wire in free space B = μ0 I / (2π r), so the magnetic field strength is proportional to the current I and falls off with distance r. The direction of the current changes the direction (orientation) of the field (right‑hand rule) but not its magnitude. The wire's metal or its temperature don't directly change B unless they change the current or introduce magnetic material with different permeability.
- the amount of the current
- the distance from the wire
Why: For a long straight wire in free space B = μ0 I / (2π r), so the magnetic field strength is proportional to the current I and falls off with distance r. The direction of the current changes the direction (orientation) of the field (right‑hand rule) but not its magnitude. The wire's metal or its temperature don't directly change B unless they change the current or introduce magnetic material with different permeability.
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