Why do sharp ends of blades attract?

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SUMMARY

The forum discussion centers on the phenomenon of razor blades attracting each other when their sharp edges are brought close together, as observed during diffraction and interference experiments. The user conducted tests using new Wilkinson Sword stainless steel blades and noted that the attraction did not occur with blunt edges. Participants suggested potential explanations, including slight magnetization from the manufacturing process and the influence of van der Waals forces. The conversation emphasizes the need for measurable evidence to confirm the magnetic properties of the blades.

PREREQUISITES
  • Understanding of diffraction and interference principles
  • Familiarity with magnetization processes in steel
  • Knowledge of van der Waals forces
  • Basic experimental design and measurement techniques
NEXT STEPS
  • Investigate the effects of magnetization on razor blades during manufacturing
  • Learn about van der Waals forces and their implications in material interactions
  • Explore methods to measure magnetic fields using a magnetometer
  • Conduct experiments with various blade brands to compare attraction effects
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Physics enthusiasts, materials scientists, and anyone interested in the properties of magnetism and light diffraction in experimental settings.

  • #31
Good idea! But now I'm quite sure it's magnetism. The compass deflects.
 
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  • #32
PhysicoRaj said:
Good idea! But now I'm quite sure it's magnetism. The compass deflects.

To be certain, you would need to eliminate or change the magnetisation and see if the force alters.
 
  • #33
Confirmed. I heated them to red hot, and now they are just steel blades. No magnetism.
Maybe they didn't show repulsion because the repelling end was blunt and B was not intense enough.
Thanks for all who helped me in understanding this.

BTW, Why do metals on heating show permanent colouration? like this:
attachment.php?attachmentid=67884&stc=1&thumb=1&d=1395473164.jpg
 

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