THE vibration-forms of membranes agitated by their fundamental and upper tones, have usually been studied by means of thin bladder or india-rubber stretched on a ring or frame (see Helmholtz ...
The discussion revolves around the effects of Helmholtz coils on the transmission of electromagnetic beams, including potential interactions based on coil configurations, frequencies, and current. Participants explore whether these coils can act as barriers similar to Faraday cages and how they might influence electromagnetic wave behavior through interference effects. Some participants ...
The discussion revolves around calculating the appropriate spacing and configuration of coils in an AC Helmholtz coil setup to achieve a uniform magnetic field (B field) in a specified volume. Participants explore the differences between AC and DC magnetic fields, the implications of using air versus iron in the setup, and the challenges of generating a strong, homogeneous B field at RF ...
Calculating the Uniform B Field in an AC Helmholtz Coil: What's the ...
The discussion revolves around the visualization and characteristics of the magnetic field generated by Helmholtz coils in three-dimensional space. Participants explore the shape and symmetry of the field, as well as the use of simulation tools to analyze it. Some participants describe the shape of the magnetic field as resembling a cuboid with arms extending in various directions. Others ...
Your post contains some confusion. First, your equation (*) for Helmholtz free energy should be written with dF rather than F. Here's a quick trick that may be helpful for treating the magnetization. How can we decide without derivation whether dW is HdM or MdH? Well, the differential energy dF is extensive (depends on volume), and only HdM depends differentially on a volume-dependent quantity ...