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# Questions tagged [magnetostatics]

The study of magnetic fields in systems where the currents are steady (not changing with time). It is the magnetic analogue of electrostatics, where the charges are stationary.

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### What is the meaning of $\vec H$ with respect to the total field?

Now before saying anything, I have seen the similar questions in this page regarding $\vec H$ but no one has fully convinced me yet, since I will try to give another perspective to this question. We ...
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### Is magnetostatics a more idealized regime than electrostatics?

The electrostatic regime only needs to consider that $\rho\neq \rho(t)$ and $\mathbf{J=0}$ and from there all the common results follow. Notice that $\mathbf{J=0}$ comes naturally if you assume that ...
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### Magnetization Enhancement Using Various Materials

I was looking online at how inserting a material inside a solenoid can enhance/reduce the magnitude of a magnetic field in all space depending on what material is inserted. This makes sense from a ...
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### Computing mutual inductance given only magnetic fields

I am experimenting with numerically computing the mutual inductance between a number of coils in the presence of various magnetic materials. Traditionally, the mutual inductance is found by ...
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### Magnetic flux in a loop from a circular coil

Problem At the center of a circular coil with length $L$, radius $b$ and $N$ windings is there a small circular ring with radius $a << b$. The ring is coaxial with the axis of the circular coil....
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### Not understanding Ampere's law

Suppose we have some wire of length $2b$ with a current $I$ flowing through it and we want to evaluate the field at some distance $a$ radially outwards from the centre of the wire (so a distance b ...
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### Conservation of Momentum violation with Lorentz Force

Note: I am describing this question using cylindrical coordinates $\hat{r}$, $\hat{\theta}$, $\hat{z}$. I've been looking into how you could slow down a plasma moving downstream in a pipe using ...
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### Pressing force of a solenoid

If a current is passed through bundle of loosely coiled, insulated wire the space between the wires rapidly contracts, crushing it down into a disk. How can this crushing force be calculated? I know ...
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### Can we use Ampere's law without requiring help from Biot-Savart law?

Consider the case of a straight, infinite wire carrying uniform current. From reversing the direction of the current we can rule out radial dependence of the magnetic field but are left with two ...