I would like an advise about how to choose the proper dimensions of two solenoids:
I would like to have them with air core, internal max diameter 4 mm, external max diameter 8mm, maximum length 2cm.
Now: these solenoids are going to be operated at 30kHz sinusoidal current so the diameter of the wire should be thin enough not to present a big skin effect but big enough to carry quite a lot of current.
The aim is endeed this:
I would like to put two solenoid (aligned on their axis) with a gap of 2.5cm between the two opposite faces (as they were a singol solenoid splitted in two parts with some distance in between)
I would like to have 50 gauss peak magnetic field in the gap between the two part of the solenoids..
Can you help me to understand if this is feasible and how to calculate the current I need?