Scientific Ontology

B

Electromagnetism

Magnetic Field

Magnetic flux density; force on moving charges and currents.

tesla (T)

Dimension: $[\,M T^{-2} I^{-1}\,]$

How values of magnetic field span the physical world (in T, log scale).

Human brain

10^-12 T

Earth's field

5.00 × 10^-5 T

Fridge magnet

5.00 × 10^-3 T

MRI scanner

3.00 × 10⁰ T

Magnetar

10¹¹ T

Lower limit10^-15 TUpper limit10¹¹ T

Lorentz Force

\vec{F} = q(\vec{E} + \vec{v} \times \vec{B})

Magnetic Flux

\Phi = B A \cos\theta

Magnetic Force on a Wire

F = BIl\sin\theta