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Gunfire-activated electromagnet

put up magnets and stop shooters with them
 
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Embed powerful electromagnets in your walls. Install microphones. Set up a program to listen for gunshots and activate the magnet closest to the sound.
Voice, Mar 17 2019

Electromagnetic bullet shield Mentioned in my anno. The idea this idea prompted me to post [notexactly, Mar 18 2019]

Technically: Yes. Practically: No. https://www.quora.c...llet-fired-from-gun
The biggest issue is that the force decays to the square of the distance. Has to be a narrow hallway. [James Newton, Mar 21 2019]

[link]






       Are bullets sufficiently magnetic to be attracted or redirected by even very strong electromagnets? I have no experience handling lead but I doubt it.
notexactly, Mar 17 2019
  

       Lead (or any other non-magnetic metal, such as copper) will be slowed as it passes through a magnetic field, due to eddy currents. But this slowing will be very slight, I think.   

       A bullet might be deflected if it passed through a non-uniform field, but then again it will be deflected far more if it passes through a non-uniform wall.
MaxwellBuchanan, Mar 17 2019
  

       Bullets are also deflected if they pass close to an Angelina Jolie so it would make sense to clone AJs and have them wander around inner cities.
bigsleep, Mar 17 2019
  

       Seeing as lead bullets are non-ferric I assumed this was supposed to pull the guns out of the shooter's hands.
doctorremulac3, Mar 17 2019
  

       //lead bullets are non-ferric// You're right, but they are metallous, which means they can be affected by relative motion through a magnetic field. But your interpretation might make more sense.
MaxwellBuchanan, Mar 17 2019
  

       Actually, someone should do the experiment. Set up a long tube with toroidal r.e. magnets all along its length (spaced out), then fire a bullet down it and see how much the velocity is reduced.
MaxwellBuchanan, Mar 17 2019
  

       What if you used lead magnets instead of iron ones?
pocmloc, Mar 17 2019
  

       They'd work just fine apart from the magnetism bit.
MaxwellBuchanan, Mar 17 2019
  

       I suppose the number of body piercings are a low number per capita. Although some individuals are very far from the norm.
wjt, Mar 18 2019
  

       This has reminded me of a related idea I came up with probably over ten years ago. I should post that.   

       [Later] I posted it: [link]
notexactly, Mar 18 2019
  

       Or iron bullets?   

       Start with cannonballs?
pocmloc, Mar 18 2019
  
      
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