Electricity & Magnetism

Biot-Savart Law

d B = \frac{μ _{0} I}{4 π} \frac{d l sin θ}{r ^{2}}

Magnetic field from current element.

Variables

dB

Magnetic field

Field from element

T

μ₀

Permeability

4π×10⁻⁷

H/m

I

Current

Current in wire

A

dl

Length element

Small wire segment

m

θ

Angle

Between dl and r

°

r

Distance

From element

m

Derivation

Fundamental law of magnetostatics.

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