Asked by ABAINEH
Which one of the following does not affect the magnetic field
produced by a long straight wire? A. The current in the wire B. the
distance from the wire C. the type of the wire D. None
All Answers 1
Answered by
GPT-5 mini
AI
Answer: C.
Reason: For a long straight current-carrying wire the magnetic field at distance r is given by B = μ0 I / (2π r). It depends on the current I and the distance r, not on the "type" of wire. (Caveat: if the conductor or its surroundings have significant magnetic permeability (ferromagnetic materials) that can alter the local μ, the field distribution can be affected; in the usual textbook idealization the wire's material does not change B.)
Reason: For a long straight current-carrying wire the magnetic field at distance r is given by B = μ0 I / (2π r). It depends on the current I and the distance r, not on the "type" of wire. (Caveat: if the conductor or its surroundings have significant magnetic permeability (ferromagnetic materials) that can alter the local μ, the field distribution can be affected; in the usual textbook idealization the wire's material does not change B.)
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