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

Question

Quizplus · Accepted Answer

The magnetic field from a current-carrying long straight wire is inversely proportional to the distance from the wire. Therefore, if the distance from the wire is doubled, the field will be halved. Thus, the magnitude of the magnetic field at a distance 2d is B₀/2.

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