I tried to watch the episode on electromagneteic interference, and was so disgusted with the "science" presented that I simply couldn't stomach it . . . the person in the video demonstrated a complete ignorance of some of the basic physics of electromagnetism, including:
- not understanding the difference between actually shielding a magnetic field, and simply shorting out the eddy current it creates
- trying to discuss the electromagnetic field created by (current flowing in) a single conductor (i.e., no return path). What next, the sound of one hand clapping?
- not understanding the effect of the twisted-pair geometry on his sacrificial ("other brands") cables, and the effect this will have on radiation of (and suceptibility to) electromagnetic fields
- (and my favorite) - implying that the aluminimum (!) foil wrap in his cables is an effective shield against a magnetic field (magnetic shields cannot be non-ferrous!)
After his introduction, I was honestly expecting for him to show us a cable ensconsed in some sort of flexible high-permability metal conduit . . . that is, actual magnetic shielding! But instead, I got a "science lesson" that makes an episode of Mythbusters look like Newton's Principia.
- not understanding the difference between actually shielding a magnetic field, and simply shorting out the eddy current it creates
- trying to discuss the electromagnetic field created by (current flowing in) a single conductor (i.e., no return path). What next, the sound of one hand clapping?
- not understanding the effect of the twisted-pair geometry on his sacrificial ("other brands") cables, and the effect this will have on radiation of (and suceptibility to) electromagnetic fields
- (and my favorite) - implying that the aluminimum (!) foil wrap in his cables is an effective shield against a magnetic field (magnetic shields cannot be non-ferrous!)
After his introduction, I was honestly expecting for him to show us a cable ensconsed in some sort of flexible high-permability metal conduit . . . that is, actual magnetic shielding! But instead, I got a "science lesson" that makes an episode of Mythbusters look like Newton's Principia.
