Recent content by TFH

Preface: If a bar magnet is cut in half, we are left with say N-S--cut--N-S allinged along the z axis. Then the S and N ends are attracted to each other. This attraction is due to the "fringing" or non-uniform B field of the poles. That is the component of the B field that is normal to the...

Are you sure the answers from the mesh analysis are correct? The line currents, IaA, IbB, IcC, should all have the same magniture and be 120 apart. Your Zwye has problems also.

ANSI C119 provides some guidance in this area. Although the calculations or models may be fun and very helpful for guidance and perhaps design, in this case it seem to me that proof would be from a certifed test not a calculation.

I believe Figure 10.1.3 shows the cross section view of a "cyliner". The cylinder height, z direction, is into the page. Equation 14: the words do say "surface current" but K is surface current denisty, Amps/length. I think the Iz in this equation should be possibly Nz (unit norm in Z...

Background: In the textbooks I’ve read the simple magnetic circuit is developed by first looking at a ferrous torus symmetrically wrapped with a condutor. Symmetry arguments indicate that the H field is radial through the torus and 0 on the inside and outside of the torus. Then from Ampere's...

Clausius2 thanks very much for your reply. My difficutly arises exactly because I too think Fy = 0. However if it does, then I don't see how Sxy = Syx because Syx = 0. And Sxy = mu dVx/dy.

RE: non-compressible, laminar flow, Newtonain fluid. Viscosity is often defined by looking at a fluid between two plates with the upper plate moving at a small velocity relative to the lower plate. The plate moves in the x direction and a velocity gradiant is created. Viscosity is then...