Recent content by magnetics

Magnetic field lines around multipolar magnets get quite complex. There are local field vectors and field gradients in the x, y, & z plane. In the following diagrams I have tried to illustrate field lines around a centrally (half and half) charged disc magnet. The top diagram represents the...

I would have thought this had more to do with homogeneous and inhomogeneous magnetic fields. Near the middle of the shaft of a long magnet, the field lines are straight and parallel and field is homogeneous. At this point along the magnet, the magnetic field is only going to exert a torque on...

Thanks BvU. v = at makes all the difference. You are correct, during the fall, a is constant, not v! What do you mean by (if interpreted somewhat liberally)?

Homework Statement A 5kg ball (m), is to be dropped 1 meter (h) in a vacuum with no resistance in the Earth's gravity (g). Use the speed and motion equations to show that its KE at impact is equivalent to its PE at its starting point. Homework Equations PE = mgh KE= 1/2mv^2...

I'd be downloading the MIT physics lectures by Prof. Walter Lewin that are freely available on YouTube...

Will this help? ... http://www.magnetic-shield.com/faqs-all-about-shielding.html

Here is the page in the middle, sorry for the confusion... :confused:

Reading their rationale they also say that... "a magnet has a magnetic equator and it is at this point where the spins of electrons change their phase relationship and present us two fields of energies and two different potentials of magnetic energy." They say the magnetic energy leaves the S...

Crazymechanic has nailed it!

The attachment had the tile "Mistaken Concepts of Magnetism". This is the name of the chapter.

It's called "Magnetism and its effects on the living system". By Davis & Rawls. First published in 1974 by Acres USA. It's not a textbook on physics and I think the disbelief that someone could have even published such nonsense has hijacked the original premise of my question.

Here it is in black and white, see attached. Yes, they go on and describe what subscribers to the Physics Forums would call the impossible and the implausible!

Another question could be, why is there very little magnetic attraction in the middle of a bar magnet? This is what I was trying to draw out.

Sorry, maybe I should have totally ridiculed the authors from the start so as to not give the wrong impression, but I try to always see things from the other person's perspective. On the previous page of the book they show the Earth's and a bar magnet's field lines in the classical way which...

Well thanks for that sophiecentaur. I know the book is wrong, what I was hoping for is a clear explanation as to why it's wrong :)