eggy/eifueo
1
1
Fork 1
Code Issues 2 Pull Requests Releases Wiki Activity

phys: clarify magnetic fields

Browse Source
This commit is contained in:
eggy 2021-02-05 19:33:01 -05:00
parent 55ba29ca88
commit 4917f30e18
1 changed files with 8 additions and 1 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

9
docs/sph4u7.md
View File

@ -10,10 +10,17 @@ Magnets are objects with north/south dipoles that create a field around them. Al
<img src="/resources/images/magnetic-field.png" width=700>(Source: Kognity)</img>
Similar to electric and gravitational fields, magnetic fields are drawn by their effect on a north pole. Since magnetic poles always appear in equal magnitude pairs, all magnetic field lines for a magnet must start at its north pole and end at its south pole.
Similar to electric and gravitational fields, magnetic fields (also known as **B-fields**) are drawn by their effect on a north pole. Since magnetic poles always appear in equal magnitude pairs, all magnetic field lines for a magnet must form closed loops from north to south **outside** and south to north **inside** the magnet. Much like electric field lines, magnetic field lines never touch
<img src="/resources/images/more-magnetic-fields.png" width=700>(Source: Kognity)</img>
Atoms in ferromagnetic materials are tiny magnets with **dipoles**. These dipoles act on neighbouring dipoles and can cause the whole object to align — this is known as an **electric domain**.
!!! note
Nickel, cobalt, or any alloy with nickel, cobalt, or iron can become magnetised this way.
**Unmagnetised** domains have dipoles pointing in random directions that are aligned when exposed to a magnetic field where they become **magnetised** domains. As such, bar magnets are always broken into smaller magnets, each with two poles — a monopole is impossible to create.
### Straight-line electromagnets
Moving electric charges produce magnetic fields. A circle filled with an "x" indicates that the current is moving away from the viewer in the third dimension while a dotted circle indicates it is moving toward the viewer.