ChatterBank2 mins ago
Metal detectors.
1 Answers
How do those big metal detectors you walk through work? Also, do they detect every single type of metal, or only certain ones, like a magnet? Also, why is it that sometimes I go through a metal detector with a few coins in my pocket and it goes off, yet other times I go through the same metal detector forgetting to empty my pockets, and it doesn't notice coins, keys, etc?
Answers
Only 1 answer
Best Answer
No best answer has yet been selected by spiffo. Once a best answer has been selected, it will be shown here.
For more on marking an answer as the "Best Answer", please visit our FAQ.
The detector make you walk through a weak magnetic field, generated by electricity. It's easier for magnetic fields to pass through certain types of metal than through you, so when metal goes through the field, there is a small change in the electricity required to maintain the magnetic field - the change is detected by the machine.
Only 1 answer
