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Omar Ibrahim
Stop it or deflect it? and what are the laws and the effects that I need to know to determine something like this?
I remember that episoderumborak said:Mythbusters has an episode on that topic, where they try to deflect a bullet with a magnet. The best they manage is by lining up a rail of super strong permanent magnets and then shoot the bullet a millimeter above the rail along it. The deflection they get is still tiny and it grazes the last magnet.
rumborak said:Mythbusters has an episode on that topic, where they try to deflect a bullet with a magnet. The best they manage is by lining up a rail of super strong permanent magnets and then shoot the bullet a millimeter above the rail along it. The deflection they get is still tiny and it grazes the last magnet.
what about lenz law ?.Scott said:Stopping it would definitely be a technological fete. But, in principle you could do that.
Although lead is not considered a magnetic material, it can be moved by a magnetic field.
To give you a sense of what might be required: Set the experiment up in orbit. This eliminates the problem of having to actually hold the bullet up against gravity when the bullet stops. The vacuum will also make it clear that only the magnetic field is responsible for changes in the bullets velocity. Then fire the bullet through a tube that will match the bullet's trajectory. All along the tube would be powerful electromagnets that would be activated as the bullet passed by - to slow the bullet and keep it in from striking the sides of the tube.
If the bullet has a brass jacket, the effect from the magnets will be better. Here are links to pages with videos showing the effect of magnets on lead and brass.:
https://terpconnect.umd.edu/~wbreslyn/magnets/is-lead-magnetic.html
https://terpconnect.umd.edu/~wbreslyn/magnets/is-brass-magnetic.html
Nidum said:The deflection was just as likely to have been caused by aerodynamic effects .
Lenz Law explains why it is possible to stop a non=magnetic, but electrically conductive bullet with a magnetic field.Omar Ibrahim said:what about lenz law ?
In this Mythbuster segment, they rated a James Bond magnetic deflection device as "Busted":rumborak said:Mythbusters has an episode on that topic, where they try to deflect a bullet with a magnet. The best they manage is by lining up a rail of super strong permanent magnets and then shoot the bullet a millimeter above the rail along it. The deflection they get is still tiny and it grazes the last magnet.
rumborak said:I disagree. If bullets were that susceptible to air fluctuations you couldn't use them for anything.
mfb said:On the positive side, this big coil will stop the bullet mechanically, and you don't even have to power it for the mechanical shielding effect...
I always forget that this is applicable to charges. and that magnetic torque on a current carrying loop can do work, now whether this applies to bullets...doesnt seem very likely that one could consider a general bullet to have any amount on non-neglible circulating current...however if one were induced...then bullets would start being made from non conducting materials...and would circumvent any electromagnetic countermeasuresZachary Burell said:Josh you could have the strongest magnet in the universe but magnetic forces do no work thus they can't change an objects kinetic energy,
also a non-uniform B field will exert a force on any dipole moment , doing non-zero workZachary Burell said:I always forget that this is applicable to charges. and that magnetic torque on a current carrying loop can do work, now whether this applies to bullets...doesnt seem very likely that one could consider a general bullet to have any amount on non-neglible circulating current...however if one were induced...then bullets would start being made from non conducting materials...and would circumvent any electromagnetic countermeasures
a super magnetic flux is all that is needed. look at how a disk drive needle works, just scale that up. there will be obvious constraints, but can still be done. and we are talking about electro-magnet, yes?Lowedown said:Yes you can deflect a bullet with a magnet but only if you set the magnet in the path of the bullet and let the bullet strike the magnet.
Nidum said:An draughtsman with a wry sense of humour working in No.8 DO once made the comment that if you wanted to stop a bullet all you needed to do was fly along side in a Concorde , reach out of the window , pick the bullet up and put it in your pocket .
It's actually easier than that. Just adopt a frame of reference in which the bullet is already at rest.Physics_Kid said:hah, so in essence, all one needs to do is swing arm very fast and nab the bullet in flight ;)
what 'for' would that be?jbriggs444 said:It's actually easier than that. Just adopt a frame of reference in which the bullet is already at rest.
There's probably a joke in there somewhere. A lawyer, an engineer and a mathematician are blindfolded in front of a firing squad...
In what frame of reference is the bullet at rest? The rest frame of the bullet, of course. Not sure what you are trying to ask.Physics_Kid said:what 'for' would that be?