Magnetic field due to a coil of N turns and a solenoid
Sep 3, 2017 · First of all let's derive the expression for the magnetic field at the axis of a current carrying coil Let's begin with a coil of a single turn and derive the expression for the magnetic field on the axis …
How do guitar pickups measure change in magnetic field?
Sep 5, 2025 · The magnetic flux whose change induces currents in conducting loops depends on $\vec B$, whence the name "magnetic induction": you get the same $\mathrm d\Phi/\mathrm dt$ whether …
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, …
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 …
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 …
Why does a changing magnetic field produce a current?
Oct 5, 2016 · A changing magnetic field induces a current in a conductor. For example, if we move a bar magnet near a conductor loop, a current gets induced in it. Faraday's law states that The E.M.F. …
Magnetic field strength vs flux density - Physics Stack Exchange
Jan 17, 2017 · Nowadays, we call B B the magnetic field and H H just the "H field". In the older books, they call H H the magnetic field, and B B the magnetic flux density or something of that sort.
Why do magnetic field lines go from North to South?
Dec 6, 2021 · If the magnetic line refers to the visualization of B-field, it actually goes from south to north inside a magnet, and north to south outside the magnet. This is because B-field is divergenceless, …
Why does electricity flowing through a copper coil generate a …
7 Can some one please explain to me why electricity flowing though a copper coil generates a magnetic field or where I could possibly find that information? An electric current (a flow of electric charge) has …