I found this article. In short it says that due to the circular way magnetic fields move, a bullet shot at you would be deflected to the side, not blocked. It would be held inside the field spinning around you or let loose like a boomerang or allowed to spin around until gravity forced it to the ground. Of course to do that you would need to charge it positively so that it would ionize, for that you need X-rays.
The problem with a magnetic field is that, to an electric charge, it must apply a force orthogonally to both the field and the motion of the charge. In the case of a charge being fired to the north, in a magnetic field pointed downwards, then the force would push the bullet to the west. This means the field would not be able to stop the bullet or push it backwards, but it could deflect the bullet to the side, spin it around and shoot it backwards, or trap in in circular motion until gravity pulls it to the ground.
A magnetic field for self-defense seems very plausible, but there is one problem remaining: most bullets used today are charge-neutral. If you can charge a charge-neutral bullet between the time it's fired and the time it enters the magnetic field, then the field would be able to affect it. The reality is, a flying bullet is charged to some extent just by friction against the gun barrel and against the air, according to Dr. David Newman, professor of Physics at the University of Alaska Fairbanks, but it could be charged much more thoroughly by exposing it to ionizing radiation, such as X-rays or Gamma-rays. These waves have high enough energy to remove an electron from an object, leaving it with a positive charge.
The final result is this: an armed assassin breaks into your living room and aims his pistol at you. You push a button on your watch, activating X-rays firing across the room and Holtzhelm coils above and below. The assassin fires, the bullet passes through the X-ray stream and leaves positively charged. It then enters the magnetic field and turns in a circle, leaving the magnetic field at almost the same speed at which it entered, passes through the X-rays again and finally hits the assassin in the chest, both wounding him and discharging on him. You are almost entirely unharmed, save for some limited and brief exposure to X-rays.
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