Electricity & Magnetism

Biot-Savart Law

dB = \frac{\mu_0 I}{4\pi}\frac{dl \sin\theta}{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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