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# HELP!! i am building an using the magnet on the back of a car speaker. Answered

i am also going to try to channel the electromagnetic waves. where should i start? How much energy would i need? How can i contain the magnetic field? at what point does the energy become harmful to the human body?

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Huh?

1) What frequency is your EMF and how do you intend to produce it?
2) First you need to know what you want to do with it (like wireless power, radio communications, gamma ray generator, etc.) then you need to know how much power is required at whatever distance then you begin to have something to work from.
3) Contain? with lots of powerful electromagnets and more energy than all the people on your street use up in a year (not likely to happen, but that's a conservative estimate). Directing that energy on the other hand is far simpler, cost effective, and doable for the amateur.
4) That depends on 1 and 2. Stick your hand into a microwave and see what happens or get under a gamma ray machine and tell the technician to turn it up to 11, you'll either hulk out or have a boiled hand or a combination of both.

I was told not to answer a question with a question, but yours are too vague.

I'm trying to build something strong enough to wipe a computer hard disk from at least 20 feet away.

*sigh*

"at least 20 feet away" - I'm guessing this means you don't want to wipe your own, since there are much easier ways to do that, which leads me to conclude that your intents are most likely malicious, and although admittedly fun, I refuse to help other peoples malice and I would expect that from nearly every ibler.

But from a scientific point of view you are certainly doing it wrong.

The electromagnetic waves?
What electromagnetic waves?

L

Those waves right there over in the corner.

What are you trying to make? From the questions, it sounds like an EMP, in which case you are best finding the biggest capacitor bank you can, then discharging it through a single coil. Alternatively, a strong spark can disrupt TV and radio signals from several meters. As for directing the EM waves, a Faraday cage will protect any important electronics. Unless anyone in the region of the device has a pace-maker, you should have no issues.

Can a spark disrupt a protected signal like a cell phone or wi-fi network?

also, is there a easier alternative (that will provide a similar effect) to a capacitor because i am just starting out and don't know much about how to attach that stuff?

A spark gap does effectively act as a radio transmitter (and were used as such in the early days of radio), so with enough power and some adjustments to the frequency you can disrupt most types of radio transmission, although I'm not sure how well it works at such high frequencies.

Capacitors are essentially small rechargeable batteries that can charge and discharge quickly, and are relatively simple to connect: Just connect to a DC supply, wait for it to charge, then connect the coil across the terminals. The only problem is that large capacitors can be dangerous and expensive to get, and work better when charges to high voltages.

The cheapest solution is to get the largest mains transformer you can find, a switch and a motor with a cam on it. Then set it up so it repeatedly connects and disconnects a battery to the low voltage side. you should get small sparks if you place the wires on the high voltage (mains) side a couple of mm apart.

Sadly I suggest your doomed to failure - your knowledge at present appears to be insufficient to a) build such a device safely or b) operate it without killing yourself.