# Tag Info

Accepted

### In a magnetic field, does the force act on the midpoint of the current carrying wire?

Believe it may just be a convenient approximation since the force is actually distributed along the entire length of the wire, which would be harder to represent in an FBD. When they say forces F1 and ...
• 324
Accepted

### Why is flux of magnetic field always zero for closed surfaces?

If it holds, the local form of the of the "non-existence" of the magnetic monopole is the Gauss' law for the magnetic field, \nabla \cdot \mathbf{b}(\mathbf{r},t) = 0 \qquad \forall \, \...
• 10.6k

### Why did static magnets make ice melt faster?

The magnets are metallic, so they are better heat conductors. Just repeat your experiment with some non magnetic material like copper, it will melt even faster. So it has nothing to do with magnetism....
• 6,366
Accepted

### Surprisingly uniform magnetic field inside a rotating charged sphere

There are equivalences you can use here. You can do the precise mathematical checks if you want to, I'll just list the steps to take: The surface current of the rotating surface charge is equivalent ...
• 4,803
1 vote

### Why is flux of magnetic field always zero for closed surfaces?

All these things are certainly true, but that is exactly the beauty of working in the differential notation of $\nabla \cdot \overrightarrow{B} = 0$. With the divergence theorem (https://en.wikipedia....
1 vote

### In a magnetic field, does the force act on the midpoint of the current carrying wire?

The key concept and word here is equipollent. Two systems of forces are "equipollent" if they have the same total force and same moments about any point. The magentic force taken to act at ...
• 54.5k
1 vote
Accepted

### What is the magnetic field created by a charged square rotating about its center

Short Answer: Your error lies in the fact that the differential length $\mbox{d} x$ and the change in radius $\mbox{d} r$ are not the same. You have confused these two quantities in your integral. ...
• 675
1 vote

### Magnetic static field simulation software to model metals in Earth's magnetic field

This is a more complex problem than you might think. Assuming a linear B-H relationship with no hysteresis makes it slightly less complex. The only analytic solutions I know of are for sphere and ...

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