If the Magnetic Field from a Current-Carrying Long Straight Wire

question 14

Multiple Choice

If the magnetic field from a current-carrying long straight wire has a magnitude B₀ at a distance d,what is the magnitude of the field at a distance 2d?

• A) also B₀
• B) 0.707 B₀
• C) 0.693 B₀
• D) B₀/2
• E) B₀/4

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