Electronics question

Like any chunk of steel, a car CAN become magnetic, with residual magnetism left over from whatever magnetic polarity it was exposed to.....but it is not a good magnetic medium....kind of imagine a bucket of screen with an outer retainer,.. holding water, when the outer bucket/field is removed the water drains quickly....

AND if you are searching for say a buried car out in a field, without any other large steel masses around, you can find it easy with a metal detector, because a MD has a tuned field and any metal it passes over will upset the 'tune' and set off the alarm.....

best as easy I can describe it.....


:D:crutches:
 
Any time electricity flows through a wire, a magnetic field is generated. The strength of the field is proportional to the amount of current flowing. I doubt it would be significant although a direct short across a battery with a wrench certainly makes my hair stand up.

DC
 
Do an interesting experiment, MY take off of a post with the copper and the magnet on U tube.....


If you have some ~3' of 1/2" copper plumbing pipe, cut off an inch from the end.....make sure it is round and free of burrs, take a small magnet...mine was 3/16 dia and about an inch long, from a burglar alarm window contact....

now, step over some carpeting, drop the magnet onto the ground, and it takes maybe a second for it hitting the carpet, do it again.....

clean out the INSIDE of the copper tube about 3' long....site through the tube to make sure it's clean.......

drop the magnet through the tube, note that it takes about 4 seconds to hit ground.....

do this again and now look through the tube to watch the magnet fall.....

you probably will not see it hit the sides of the copper pipe/tube.....


now take that ~1" long section of pipe and lay on a flat smooth surface, say your kitchen counter top, now shine a flash light on it really close, and take the magnet to stab the end toward the small pipe without touching it....watch the pipe roll......and if you control it just right, you can get the pipe to roll many inches.....in one direction without touching it.....


:bump::bump::harhar:
 
DeeVeeEight said:
Do cars generate a magnetic field and if so is it significant?
Click to expand...

First of all, any current flowing through a wire will create a "magnetic" field...actually the correct term is ...it will create an H field. The opposite is that a antenna propagating a radio frequency signal will, at the far field, be generating an "E" field.

You're car, especially when you have a battery heavy charging or discharging event will create a magnetic field that could theoretically be detected by a compass that would deflect somewhat. It'd be pretty small.

At Edwards AFB, left over from WWII, is a very large circle etched on the desert salt floor. The circle is visibly divided into degrees for the circle. The application was that a WWII airplane would fly over, say the North South line, and calibrate it's magnetic compass to the etched ground line. Currents flowing in the normal aircraft circuits might cause a deviation of the on board magnetic compass...however when flying over the ground reference of North/South the on board airplane compass would be recalibrated to account for nominal current flows on the aircraft.
 
68/70Vette said:
At Edwards AFB, left over from WWII, is a very large circle etched on the desert salt floor. The circle is visibly divided into degrees for the circle. The application was that a WWII airplane would fly over, say the North South line, and calibrate it's magnetic compass to the etched ground line. Currents flowing in the normal aircraft circuits might cause a deviation of the on board magnetic compass...however when flying over the ground reference of North/South the on board airplane compass would be recalibrated to account for nominal current flows on the aircraft.
Click to expand...

Just about every large airport that has a maintenance facility on the field has one. Drag the plane out, set it on the N-S line, turn it 180* and take out 1/2 of the error. Do the same for E-W. Then do the N-S again. Takes a lot of time, but it gets done. And the manual tells you what has to be on- radios, transponder, IRU, whatever.
 
I know you all seen ships Binnacles .....with the Magnetic Navigation compass inside on the gimbals, the dome over top, with a glass hatch cover, the nav rings on top for various purposes I don't really understand too good, and of course the Red and Green ~6" diameter balls on either side, one to port, red, and one to starboard, green.....

they took the boats out in the ocean, and with star navigation at night, located north, and then compensated with the balls, did the same shit as the planes, essentially....big old steel boat....:clap::drink:

OH, I forgot to mention, they did have giant coils used for degaussing/demagnetizing the entire ship.....fed by AC current from hell....
 
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