Magnetic Field Calculator

Calculate the magnetic field around a long straight current-carrying wire using B = mu0 * I / (2 * pi * r).

A
m

Magnetic Field

0.00004000 T

Magnetic Field (μT)40.00 μT

Magnetic Field vs Current

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Formule

## Magnetic Field of a Straight Wire A current-carrying wire generates a circular magnetic field around it. ### Formula **B = mu_0 * I / (2 * pi * r)** where mu_0 = 4*pi x 10^-7 T·m/A is the permeability of free space. The field direction follows the right-hand rule.

Exemple Résolu

Magnetic field 5 cm from a wire carrying 10 A.

  1. 01B = mu_0 * I / (2*pi*r)
  2. 02B = 4*pi*1e-7 * 10 / (2*pi*0.05)
  3. 03B = 4e-6 / 0.1
  4. 04B = 4e-5 T = 40 μT