The current in a long wire creates a magnetic field in the region around the wire. How is the strength of the field at distance r from the wire's center related to the magnitude of the field? A) field directly proportional to r B) field inversely proportional to r² C) field directly proportional to r² D) field inversely proportional to r

Question

Quizplus · Accepted Answer

The magnetic field strength around a long straight wire is inversely proportional to the distance from the wire, following the formula B = (μ₀I)/(2πr), where B is the magnetic field, μ₀ is the permeability of free space, I is the current, and r is the distance from the wire.

The Current in a Long Wire Creates a Magnetic Field