Recent content by soljiang

Hi, mfb, so it's true that if a shape is only symmetric about x or y axis, it's not easy to integrate the surface area using spherical coordinate, unless one redefine the orientation of coordinate. Is that correct? Thank you.

So does it mean spherical coordinate is only useful for calculating shapes/surface that's axially symmetric about z axis but not about x or y axis?

I read that if the cone with apex angle 2α whose central axis is vertical, apex at the origin, then one can use spherical coordinate to calculate the solid angle of the cone ∫02∏∫0αsin\varphid\thetad\varphi However, what if the central axis is align to y-axis horizontally, instead of...

Here's a fourth picture that shows the uniformity of the B when aspect ratio is high.

I've a question on ferromagnetism. I've been trying to simulating the field around a rod shape magnet, cylindrical in shape and N on one end and S on the other. I just wonder if one would expect the the B, the magnetic flux density, to be uniform in magnet. I used comsol to simulate and get...