The magnitude of the magnetic field of a straight (infinitely long) current-bearing wire as a function of the distance r (from the wire) is proportional to A) 1/r. B) 1/r². C) 1/r³. D) 1/r⁴.

Question

Quizplus · Accepted Answer

The magnetic field around a long straight conductor is described by Ampère's law, which states that the magnetic field (B) is inversely proportional to the distance (r) from the wire, hence B ∝ 1/r.

The Magnitude of the Magnetic Field of a Straight (Infinitely