Monday, June 23, 2014

electromagnetism - Is it possible to detect fake Tungsten aka Wolfram gold bars with a strong magnet?


Tungsten aka Wolfram is paramagnetic so it is weakly attracted to magnets.


A guy devised the following to test for Tungsten in gold bars:


http://www.youtube.com/watch?v=foELQ7T8_90


But he is using a paperclip and not real Tungsten.


Question: How strong a magnet do I need in order to achieve a significant attraction to Tungsten. By significant I mean that it should exert a force of several (1/100)*grams so that it can be measured with a scale as in the YouTube video. Will a Neodymium magnet do? If yes, what should be the strength of the magnet in kg?





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