Magnetic RCA adaptors: Latest snake oil?

Because the magnets cause the magnetic field to leave at a right angle to the wire.

Probably, but I remember years ago when I moved by outboard transformers for some old
PS Audio power amps and told my favorite salesman (very timidly, since I didn't want to make it sound like I heard the huge difference that I had heard).  He told me that he'd been in the business 20 years at that point and if I "told him the amps got up and marched around the room",
he'd believe me.  You never know until you try, but some tries cost more than others.

The vector of the induced magnetic field in the cable, the one produced by current flowing through the cable, IS at a right angle to the cable. So one wouldn’t need anything else to cause it to do that. So it must be something else.

Again, I suggest reading Dudley's article, it includes a description of Ric Schultz's design and what he claims it does. While it made things worse in Art's system, he didn't discount that it might work in other systems. 

Gentlemen,
Seems mighty easy for the naysayers to call products "snake oil" when they never tried the product.
Before you bash something and say it can’t work you should try it for yourself, and then state your thoughts based upon your experience, good or bad.
There are other forums here on Audiogon where the HFC products are discussed by people that own and use the products: https://forum.audiogon.com/discussions/high-fidelity-cables-ct-1designed-by-rick-schultz
Regarding Dudley's article; I posted the following based upon my own experience:
I just read the article in Stereophile regarding the HFC magnetic adapters. One thing I learned more then a year ago is you have to put any HFC product in place, and leave it there for let's say 24 - 48 hours and let it settle in and do whatever it is that it does within those hours. I also suffered from the frustration of not being able to put a HFC product in and out to do a comparison test, but it just doesn't work that way. Personally I think that's the error that Art Dudley made. He described honestly what he heard but I don't think he realized what I described above. Just my personal opinion.