2013年6月11日 · There's only two ways to do that. First, with mu-metals, second with superconductors. both will "become magnetized" in the field. (the super conductor will generate surface currents from the magnetic field, and those currents will generate their own magnetic field that will exactly oppose the magnetic field lines entering it). $\endgroup$

2018年7月14日 · Also, if there were magnetic monopoles, they would try to follow the magnetic field the way electric charges try to follow the electric field lines. Now we consider the magnetic field due to magnetic monopoles, which is going to be conservative. So Is there a precise answer? or the nature of the magnetic field depends on the way you produce it?

2019年4月19日 · In other words, it is producing a changing magnetic field over time. Remember, according to Faraday's Law, it is only a changing magnetic field that will induce voltage elsewhere. Now that we know the one of our transformer sides is producing this changing magnetic field, lets look back at the whole situation. $\textit{Two Inductors (A ...

Just as field lines concentrate when entering the south pole of a magnet from a large area, an external magnetic field can be "gathered" using, for example, a cone-shaped piece of iron. The cone can be positioned such that the static field spread over a …

Does it make sense to state a magnet has a field of $0.5~\mathrm T$ and a field strength $\vec H$ of $9\times10^5~\mathrm{ A/m}$? electromagnetism magnetic-fields

However, it could be misleading to say that the magnetic field cannot do work at all - a time varying magnetic field always begets an electric field which does do work on a charge - alternatively one can store energy in the magnetic field - it has energy density $\frac{|\mathbf{B}|^2}{2\mu_0}$ and the electric field arising from the time ...

2022年4月2日 · These magnetic field lines come out from the north pole of the bar magnet, take a turn, and finally reenter at its south pole. (image from Hyperphysics - Bar magnet) Now you may still be confused by the behavior of a compass in the magnetic field of the earth. The north pole of the compass needle points to the north pole of the earth.

2016年8月15日 · The fact that the magnetic forces do not work is not owing to the smallness or largeness of the magnitude of the magnetic field or magnetic force. But it is owing to the direction of the magnetic force relative to the direction of the velocity of the charged particle.

2020年11月26日 · Force due to magnetic field on charged particle is given by. F=Bvq sinθ. Thus magnetic field produces a variation in force only when there is a variation in velocity of charged particle of fixed charge. But our aim is to probe angular momentum. So multiply a radial distance perpendicular to velocity

As you pointed out correctly, a magnetic field is created by a moving charge (current) with respect to the observer. If the charge is at rest with respect to the observer, only an electric field is seen. The fact that a magnetic field looks the way it does can be …