Common Magnetic Field Strengths
1 T = 10,000 G
Basic conversion
50 μT = 500 mG
Earth's magnetic field
1.5 T = 15,000 G
MRI machine
0.3 T = 3,000 G
Neodymium magnet
🔬 Electromagnetic Theory & Fundamentals
Maxwell's Equations & Magnetism
Magnetism is fundamentally described by Maxwell's equations, which unify electricity and magnetism:
∇ × B = μ₀J + μ₀ε₀ ∂E/∂t
This shows how magnetic fields (B) are created by electric currents (J) and changing electric fields (E).
Interactive Field Visualization
Click buttons above to visualize different magnetic field configurations
📚 History of Magnetism Discovery
600 BC
Ancient Greeks discover magnetism in lodestone (magnetite)
1269
Petrus Peregrinus writes first scientific treatise on magnetism
1600
William Gilbert publishes "De Magnete," proving Earth is a giant magnet
1820
Hans Ørsted discovers electromagnetic induction
1831
Michael Faraday formulates Faraday's law of electromagnetic induction
1865
James Maxwell unifies electricity and magnetism with Maxwell's equations
Medical Imaging
MRI scanners use 1.5-3T fields
Maglev Trains
Magnetic levitation transport
Data Storage
Hard drives & magnetic tape
Audio Equipment
Speakers & headphones
Power Generation
Electric generators & motors
Navigation
Compasses & GPS systems