electromagnetism

While a lightning strike occurs between a cloud and an object on or near the ground, it takes the path of least resistance, which means it moves towards the closest object with the highest electric potential

I find it difficult to understand bound charge and figure out its quantity. At first, bound charge is introduced to me by the comparison with free charge--I thought bound charge is the charge that is ...

I am trying to understand field lines between two charges, and my understanding is leading to a contradiction and I would like to know where my thought processes are making a mistake. I have found the ...

To be clear, I am not questioning the equation $\nabla\times\mathbf{E} = -\frac{1}{c}\frac{\partial}{\partial t}\mathbf{B}$ or its integral form. What I seriously doubt is the causal interpretation ...

_Zenodo_. 2026This paper proposes a reformulation of classical electromagnetism within the framework of Cognitional Mechanics (CM), in which Maxwell’s equations are not treated as four independent dynamical laws but as decomposition sectors of a single operational closure constraint. The central claim is that electromagnetic field structure arises as a Tier-3 projection of a deeper Tier-2 operati…

This post raises a fundamental question about the violation of Newton's third law in electromagnetism and possible conclusions. There are textbook examples in electromagnetism in which you may notice that the third law of Newton may not hold in its conventional form. That does not necessarily... Read more

Consider a point charge $q$ moving with a constant velocity $\mathbf{v}$. At some field point $P$, the charge generates an electric field $\mathbf{E}$ and a magnetic field $\mathbf{B}$ that are both ...

Recently I Fell Into The RF Rabbit Hole And Realized Antennas Are Basically Physics Speedrunning Recently I met some experts in the radio frequency space and accidentally fell into one of the deepest engineering rabbit holes I’ve hit in years. These guys were sitting there with SDRs — software-defined radios — casually dragging sliders around while entire invisible worlds appeared on screen. Airp…

From what I understood, magnetic flux depends on the angle between the magnetic field and the normal to the coil surface. When the coil is aligned so that the magnetic field passes directly through it, the flux is maximum because cosθ becomes 1. As the coil rotates, the value of cosθ changes... Read more

Background. I have been building a systematic dimensional map of electromagnetic quantities, organized by their MLTIQNJ exponents. The map places mechanical quantities along a central vertical axis, with electric quantities to the left and magnetic quantities to the right — connected by... Read more

Today in class, we did Faraday's ice pail experiment. For those who are not familiar with the experiment, we charged an isolated conducting bucket with a lid on top. We then tested the charge on the ...

So Faraday's Law of induction states this: $$ \nabla \times E = - \frac {\partial B} {\partial t} $$ Or if we write it in it's integral form: $$ \int E \cdot dl = - \frac {d \Phi_B} {dt} $$ which (to my understanding) means that the magnitude of the EMF around a coil of wire will be equal to... Read more

I just went over Chapter 27 of the Feynman Lectures on Physic Volume II, where he derived the energy density and energy flow for the electromagnetic field. He derived everything out of Poynting's ...

Two conducting spheres bearing charges $Q_1$ and $Q_2$ are connected by a very long thin wire. Current flows and after some time, the entire system reaches a state where potential is the same ...

Two conducting spheres, one bearing a charge $Q_1$ and another $Q_2$ are connected by a very long thin wire. Current flows and after some time, the entire system reaches a state where potential is the ...

harmyder - 33 - 1 Suppose an uncharged hollow metallic sphere has a non-centered charge inside. In this case, the charge distribution and field lines are like this Wouldn't such an uneven charge distribution on the inside and outside of the conductor create a field inside the conductor? Wouldn't such an uneven charge distribution on the inside and outside of the conductor create a field inside th…

Well, I am a bit behind in this project.  It's now April, and I am posting about February's book of the month. I have had my copy of Bleaney & Bleaney's Electricity and Magnetism (vol 1) since the early 90s when I was an undergraduate student at Oxford.  It was one of the small number of physics books I got a copy of from the reading lists, what with textbooks being expensive and me not having mu…

The biggest difference is that a gravitational field is mathematically classified as a tensor field while magnetic fields, or actually electromagnetic fields, are vector fields. This means that it takes 4×4=16 components to define a gravitational field in general while it only takes 4 components to define an electromagnetic field. The number 4 comes up … Continue reading How does a magnetic field…

James Clerk Maxwell [1831-1879] was a Scottish physicist and mathematician who is best known for equations which unified electricity, magnetism and light into one coherent subject of electromagnetism. As a result of his work, Maxwell is considered one of the greatest physicists of all time. Maxwell lived a short but a truly fulfilling academic life, regarded on par with Newton and Einstein. He is…

Embarking on an Electromagnetic Odyssey: The Technological Symphony Unveiled! Delve into the captivating interplay of forces as we unravel the fundamentals of electromagnetic forces. Picture the mysteries of attraction and repulsion, the unseen dance that underlies the very fabric of our technological world. Ride the waves of innovation in communication technologies, where electromagnetism powers…