Magnetic field insulators - Physics Stack Exchange
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). $\endgroup$
Magnetic field due to a coil of N turns and a solenoid
2017年9月3日 · 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 of this coil. The cos components of the magnetic field cancel out due to symmetry and the sine components add up along the axis.
Work done by magnetic field - Physics Stack Exchange
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 ...
What is meant by “changing magnetic field” - Physics Stack …
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 ...
Can magnetic fields be redirected and focused at one point?
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 …
electromagnetism - Is magnetic Field conservative in nature?
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?
Difference between B and H in magnetic fields? [duplicate]
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
Can someone please explain magnetic vs electric fields?
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 …
electromagnetism - Is the magnetic field really a relativistic effect ...
2022年7月9日 · The magnetic field is not a relativistic effect of an electric field. A magnetic force on a single charge can always be transformed into a purely electric force in another reference frame. The same is not true of a magnetic field .
electromagnetism - Work is not done by the magnetic field?
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.