Re: Oops -forgot about EMF - Saab General Bulletin Board - Saabnet.com

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Re: Oops -forgot about EMF

Posted by Snowmobile [Email] (#686) [Profile/Gallery] (more from Snowmobile) on Thu, 15 Feb 2018 05:38:19 Share Post by Email
In Reply to: Oops -forgot about EMF, Dave The Ice Age Knave [Profile/Gallery] , Wed, 14 Feb 2018 09:44:00
Alert me when someone posts in this thread:
By EMF, I assume you mean electromagnetic fields? (and hopefully not the band - their music could I suppose have various, even "unbelievable", effects on the human body!)

I would not in any way worry about my safety in the presence of the field through the ignition switch of an ICE vehicle. There is not all that much current and it is essentially DC. Magnetic field around a wire is proportional to current but falls off at 1/r (1 over distance from the wire. So if you hypothetically had 10A (a lot!) through a wire, at a metre, it works out to about 2x10-6 T of magnetic field (0.02G), or about a 10th of the earth's magnetic field. At 1 cm, it is 10x the earth's field, but this amount of static field is in no way dangerous. I do not fear for my kids when they play with bar magnets.

That example is a DC current, so the magnetic field does not change with time. EM fields can be time varying and their frequency makes a big difference in how we percieve them. Electromagnetic fields are dangerous when they are at certain frequencies with enough intensity, eg a microwave oven, or UV light, or X-rays.

In a car (EV included), you are dealing with low frequencies and moderate currents, so basically static fields. This would not concern me at all. Even for an AC motor in a car (with an inverter), I would not be concerned.

I watched an art film last year about someone's perception of sensitivity to stray fields. It was interesting from an artistic perspective but it seemed at odds with physics in many aspects. Maybe some people are more affected by this than others but how is unclear. The human body is complicated both physiogically and psychologically.

EMF!

->Posting last edited on Thu, 15 Feb 2018 05:40:25.

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