What is the difference between the magnetic $H$-field and $B$-field?
43 In layman's terms, E and B are the total electric and magnetic fields. D and H are the free electric and magnetic fields. P and M are the bound electric and magnetic fields. M would be the magnetic field …
Why are magnetic fields that shape? - Physics Stack Exchange
Sep 18, 2025 · A macroscopic magnetic field is achieved by aligning the atomic magnetic fields. In a permanent magnet, these aligned electrons (below the Curie temperature) hold each other in place, …
Magnetic field strength vs flux density - Physics Stack Exchange
Jan 17, 2017 · Nowadays, we call $\mathbf B$ the magnetic field and $\mathbf H $ just the "H field". In the older books, they call $\mathbf H $ the magnetic field, and $\mathbf B $ the magnetic flux density …
How do moving charges produce magnetic fields?
A charged particle moving without acceleration produces an electric as well as a magnetic field. It produces an electric field because it's a charge particle. But when it is at rest, it doesn't produce a …
What are the fields produced around a current carrying conductor?
For the magnetic field, the currents are one source of the magnetic, but this problem is more linked to the source of the current in the wire. For a conductor with finite conductivity, an electric field is …
How are compasses influenced by a magnetic field?
Apr 2, 2022 · Like magnetic poles repel, and unlike magnetic poles attract each other. Therefore the north pole of the compass needle points to the south pole of the bar magnet, and vice versa. But …
Direction of magnetic field in a solenoid - Physics Stack Exchange
The magnetic field lines of a line-current curl around that line, and Two parallel currents feel an attractive Lorentz force; two anti-parallel currents (parallel but flowing in opposite directions) feel a repulsive …
Magnetic field outside a solenoid - Physics Stack Exchange
Aug 11, 2021 · The magnetic field outside an infinitely long AC solenoid is NOT zero, as shown by explicit calculation from Maxwell's equations by Abbot & Griffiths, American Journal of Physics 53, …
Why is the magnetic field inside a solenoid constant?
Aug 27, 2011 · The force of a magnetic field is maximized when the current moves perpendicularly to the field lines, but is zero when it moves parallel to it; therefore, we can assume that in a solenoid the …
What is the direction of magnetic field lines?
Mar 16, 2021 · The direction of the magnetic field lines is the direction of the B-field. By convention they go from North to South. Sometimes it seems confusing. Let's put a wire under a compass, so that it …