Sean Breheny wrote:
>
> Hi Wagner,
> I have often thought about this,and I'm not sure exactly what the answer
> is. First of all, any time you have a current flowing, you will have  a
> loop (even if the wire is straight for a long distance,something must
> eventually connect it back to the supply). Yes, there will be a magnetic
> field around the wire,but I don't know how you could analyze how much
> voltage this will induce without taking some loop area into account,since
> the voltage induced is the magnetic field (flux density) integrated over
> some area, times a constant.
> Sean

Yes Sean, it develops magnetic field and in the same rules and manner.
AC current meters use a coild around a plain wire to measure it.
Coiling a wire just increase the flux.

A question to think:

What happens if you build a coil with 50,000 turns of a superconductor?
Suppose the overall impedance allows a simple 1.5V battery cell to
supply 200mA of pulsing current. This arrange can generate a stupendous
magnetic flux.. right? or wrong? During the developing of the flux,
it also creates the impedance, right?
--------------------------------------------------------
Wagner Lipnharski - UST Research Inc. - Orlando, Florida
Forum and microcontroller web site:  http://www.ustr.net
Microcontrollers Survey:  http://www.ustr.net/tellme.htm