Louis La Minh Hoang

Today’s physics lesson took me deep into one of the most mind-bending topics yet — electromagnetism. It’s strange how something completely invisible can be so perfectly predictable through mathematics.

We began with the basics of magnetic fields, revisiting how current-carrying wires create circular field lines, and how solenoids act like controllable magnets. But soon, we dove into the advanced part — how changing magnetic fields induce electric currents, and how that interplay builds the very foundation of our technology.

The equations weren’t simple — they required not just algebra, but a strong geometric sense. Understanding the right-hand rule, field direction, and how flux changes across surfaces demanded precise visualization. We explored Faraday’s Law, Lenz’s Law, and how negative signs reveal nature’s tendency to resist change.

Then came the thrilling part: the electromagnetic field — the unification of electricity and magnetism. We analyzed how a moving charge produces both electric and magnetic components, and how together they form Maxwell’s masterpiece — the electromagnetic wave. We didn’t just study the formulas; we examined how they behave, how they ripple through space at the speed of light, binding electricity and magnetism into one elegant theory.

Our teacher challenged us with complex problems — not just plug-in calculations, but ones that required deep physical intuition: predicting the direction of induced currents, analyzing forces on moving conductors, and reasoning through three-dimensional field interactions.

By the end, I realized — electromagnetism isn’t just a chapter in physics. It’s the architecture of reality itself. Every light beam, every Wi-Fi signal, every heartbeat monitored by a sensor — all of it comes from these swirling, intertwined fields we can’t see, but can understand through pure reasoning and mathematics.