Electricity & Magnetism

Magnetic Field (Long Wire)

B = \frac{\mu_0 I}{2\pi r}

Magnetic field around long straight wire.

Variables

B

Magnetic field

Field strength

T

μ₀

Permeability

4π×10⁻⁷

H/m

I

Current

Current in wire

A

r

Distance

From wire

m

Derivation

From Biot-Savart law or Ampere's law.

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