Written by the Fiveable Content Team • Last updated August 2025
Verified for the 2027 exam
Verified for the 2027 exam•Written by the Fiveable Content Team • Last updated August 2025
Definition
The equation for the magnitude of the magnetic field at a perpendicular distance r from a long, straight, current-carrying wire, where I is the current and μ₀ is the permeability of free space.
AP course connection
Topic 12.3: 12.3 Magnetism and Current-Carrying Wires