electromagnetism - Principle of equivalence between a magnetic …
So by a dipole field we mean a field whose potential looks like $\mathbf p \cdot \mathbf r /r^3$, and its source is an electric dipole. Of course the magnetic field has a vector potential rather than a scalar potential, so by a magnetic dipole field we should mean one where the vector potential is like $\mathbf A \sim \mathbf m \times \mathbf r ...
What is doing the work on a magnetic dipole in a magnetic field?
May 27, 2021 · The negative sign indicates the tendency of the dipole to be aligned with the magnetic field; a dipole transverse to its local magnetic field has more energy than when it's parallel to the field. Looking at your computation, it looks like the confusion lies in how you've defined $\theta$ .
How to calculate the magnetic dipole moment of a bar magnet?
It is important to remember that although this may be the dipole moment of a bar magnet, a bar magnet has non-zero higher order moments whose contributions to the field fall off faster than the dipole $1/r^3$. The magnetic field of a bar magnet only matches a dipole field for distances much greater the dimensions of the magnet.
Magnetic dipole and magnetic moment - Physics Stack Exchange
A magnetic dipole is an idealized current loop - where area goes to zero and current to infinity so that their product is finite. The closer you approximate this situation, the more the field starts to look like a dipole field - analogous with the field created when you approach a positive and negative charge closer and closer together, with ...
Calculation of magnetic dipole moment of the Earth - Physics …
Mar 9, 2024 · The Earth's magnetic dipole moment is important because it helps in understanding the geomagnetic field, which protects the planet from solar wind and cosmic radiation. It also plays a crucial role in navigation, both for animals and human-made systems, and provides insights into the Earth's interior and geodynamo processes.
electromagnetism - Formula for force on a magnetic dipole
Mar 30, 2022 · It is a magnetic analogue of the electric dipole, but the analogy is not perfect. In particular, a true magnetic monopole, the magnetic analogue of an electric charge, has never been observed in nature. However, magnetic monopole quasiparticles have been observed as emergent properties of certain condensed matter systems.
Magnetic Dipole: How to plug into Maxwell's equations?
$\begingroup$ If magnetic charges would exist in Maxwell equations: $\mathbf{\nabla}.\mathbf{B} = 4 \pi \rho_m$ where $\rho_m$ is the magnetic charge density, then the magnetic dipole solution can be obtained exactly in the same way an electric dipole is obtained in the standard Maxwell theory; i.e., by taking two opposite infinitesimally ...
Magnetic Dipole Moment - Physics Stack Exchange
Magnetic Dipole Moment. Ask Question Asked 8 years, 2 months ago. Modified 5 years, 11 months ago. Viewed ...
Magnetic Dipole Moment of a bar magnet - Physics Forums
Jan 11, 2019 · What is the unit of measurement for magnetic dipole moment? The unit of measurement for magnetic dipole moment is ampere-meter squared (A·m²) in SI units. In cgs units, it is measured in ergs per gauss (erg·G). How does the magnetic dipole moment of a bar magnet affect its strength? The magnetic dipole moment of a bar magnet directly affects ...
electromagnetism - What happens to a (moving) magnetic-dipole …
Feb 5, 2019 · A magnetic-monopole, if existed, would experience force in direction of external magnetic-field, which, is proved by behavior magnetic-dipoles. Something interesting happens when a moving electric-charge enters external magnetic-field, i.e., force is in direction given by vector-product (vector cross product) of velocity and field.
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