I have a question about EMPs
now, i think i have made them before as i was experimenting with magents a while back (almost knocked out my calculator if i remember correctly, but what is the usuall way of making one? what determines how strong the field is? how about how large it is?
i amthinking of pulling a small prank on a friend of mine and a mini EMP would be perfect hehehe

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MarsGhost
59 Views and no replies... Aww! Okay, the 'usual' way of creating an EMP is through a nuclear detonation. No fissile material? Okay, try using a flux compression generator. Again, you'd need explosives but doesn't have to be nuclear... Or a -very- time consuming way which hasn't been published because I made it up (LoL) is to rig a large coil which can disassemble itself through non-ionic means. EG Not using acid to dissolve the coil as this would short-circuit the system and no EMP, plus it has to be done in a fraction of a second.

The EMP in any of the 'safe' types above is/would be created through a very large magnetic field having nowhere to go as an electromagnet is potentially stored current. If you suddenly break a circuit with a large magnetic field attached to it, you get a sparking effect which causes crackling on TVs, or a shock if you're stupid enough to be holding bare wires. This is caused, I think, by the magnetic field collapsing which means it's moving, which generates current, which slows the rate of collapse. In any case, if you do this along the entire coil in just more than an instant, the spark which effects TVs by inducing a small current in the wire 'stacks' into a large pulse. Well done, you've just created your first EMP.

The trouble is, cheaply, a flux compression generator is still dangerous. You have to blow the coil, with attached high capacity capacitors to maximize field strength, in a sequence traveling along the coil. Each charge has to be powerful enough to almost vaporise the part of the coil it's destroying. Plus, as a prank? I mean, if it's his computer you want to effect, I don't think he'll see the funny side as it's rendered useless. It's kinda the equivilent of running car battery terminals through all the circuitry and the mess of the explosives around the corner's going to turn some heads. And it's not going to be focused, no, so it'd be a -lot- of computers, TV's... You get the idea.

NB: A few assumptions are made here. Even if the theory behind it is wrong, the apparatus is correct. I just thought some reply is better than none for a topic as interesting as EMP's.