Recent content by SirR3D

Can anyone explain how this electric motor works? www.youtube.com/watch?v=i7LOF1GZpdo The spinning wheel is parallel to the magnetic field lines produced by the current through the shaft so what exactly drives this?

As I said, in the manner I'm trying to solve it I have too many unknowns. I get 6*pi*η*R*vterminal = mg - ρVg - kx But I do not know η and vterminal Is there any way to solve this without needing to find vterminal

So there is this ball held on a spring. It's radius R = 0.015m , and density ρ=7800kg/m^3. It's oscillation period in air is 1.256 seconds and in the fluid it changes to 1.57 seconds. Find the viscosity of the fluid considering that the drag force obeys Stokes law. I first found the spring...

Yes you are right. I feel foolish for not realizing this from the start. Thanks for your time. So there is no way to make an isotropic antenna? I was also thinking of a magnetron with equally spaced resonant cavities positioned normally on a sphere which act like wave guide antennas. But i can't...

As any RF engineer knows the radial antenna is something pure theoretical. But as someone who loves physics an idea came to my mind. Please tell me if this would work and if not, why does it fail to work. So: Assuming we have an atom with 8 valence electrons which is hit with 8 photons with...

Hello Dave, as you can see the E and B fields in this image are orthogonal. Therefor it is a bad image since it clearly states that they are not orthogonal. Anyhow I came up with an explanation myself trying to figure it out. In the near field the electromagnetic field is not formed, therefor it...

Yeah I've read this before posting, but it doesn't really give a good explanation on what I'm asking. It only says something vaguely about my question. And there are no images on how the EM field looks like in the reactive region.

Hello, I've heard in many places that in the "near reactive field" of an antenna which is the region really really close to the antenna, the E and H fields are not perpendicular. But I just can't imagine how that is possible since In Maxwell's 3'rd and 4'th equations it is explicit that the curl...

Hello, I am in 4th year electronics and telecommunications. I am really good at mathematics and physics so I was thinking to go for microwave/RF engineering which I also hear is the hardest of all forms of engineering. The thing is everyone in this field which works as an engineer (not a...