This is the fourth time I\'ve asked this on here and can\'t evenget a response e

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This is the fourth time I've asked this on here and can't evenget a response even though I paid $40 for the yearlymembership. Can you say rip off? I got one answer but theperson just gave an equation and I had no idea what they weretalking about. I just need a simple explanation ( noequations) so I can just get an idea and finish this labreport already. Question: Why are the measurements of the magnetic fieldinside a rectangular coil not taken very close to the wires? This is the fourth time I've asked this on here and can't evenget a response even though I paid $40 for the yearlymembership. Can you say rip off? I got one answer but theperson just gave an equation and I had no idea what they weretalking about. I just need a simple explanation ( noequations) so I can just get an idea and finish this labreport already. Question: Why are the measurements of the magnetic fieldinside a rectangular coil not taken very close to the wires?

Explanation / Answer

Let’s back-up a moment and review a basicconcept—that of an infinitely long wire that has a current ofx-amperes. Don’t forget! You’re the size ofan electron and on that scale a wire only a few centimeters longappears to be infinitely long.

You may recall from your class on basic electromagnetic fieldsthat a wire with a current of x-amperes has a magnetic field thatencircles the wire; the magnetic field intensity, H(), variesinversely with the distance, , from the wire’ssurface. That means as you get closer to the wire the magneticfield intensity is increasing. Indeed, if the wire were aperfect conductor and you actually touched the wire, =0, themagnetic field intensity would be INFINITE and you would explode;because, as you know, all of the known elements within the periodictable contain electrons that are moving and therefore have anH-field of their own. Now that you have that concept, you knowright away that’s not the answer the professorexpects. Yet at the same time, you are beginning to see thatas you get close to the wire, you no longer see a macro effect ofmany wires that are close neighbors, but of a localized effect of asingle wire. (Light bulb!)

So, just to ensure the point is made—and before you leavethe small world—let’s ride the molecule back to thegeometric center of the solenoid. As you navigate toward thecenter of the solenoid, you are able to see not only the H-fieldfrom the single wire, but the H-field from its adjacent neighbors;and as you continue you see more and more H-field contributionsfrom neighbors that are two, then three, then four, etc. wires awayfrom the single wire. Thus, the center of the solenoid is theconfluence of numerous H-field contributors and represents a good,if not exceptional, place to measure magnetic fields.

Now it’s back to the real world. Welcome back,Alice.

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