The bifilar pancake coil at its resonant frequency

[synchro1]

@nelsonrochaa,

Thanks for the clarification. Consider this:


"Ørsted discovered the connection between magnetism and electric current when a magnetic field produced by a current-carrying copper bar deflected a magnetised needle during a lecture demonstration".


"In the CGS system, the unit of the H-field is the oersted and the unit of the B‑field is the gauss. In the SI system, the unit ampere per meter (A/m), which is equivalent to newton/weber, is used for the H‑field and the unit of tesla is used for the B‑field".

"H is measured in units of amperes per meter (symbol: A⋅m−1 or A/m) in the SI. B is measured in teslas (symbol: T)".


This is what you need to understand: The H field is an electrical equivalent and the B field a magnetic one.

@Tinselkoala,

You see fit to lecture me on the H and B field?

[tysb3]

https://www.youtube.com/watch?v=u6jBtZ4VPC4

all 6 bif. pancake coils are the same resonance frequency

[MileHigh]

Put your phasors on spin....

http://www.learnabout-electronics.org/ac_theory/lcr_para_101.php

[synchro1]

Lenz's Law:

When a magnet approaches a coil, a current runs in one direction and the ammeter registers a plus indicating a positive current. When the magnet's pulled away from the coil, the current runs in the opposite direction and the ammeter registers a negative indicating a reverse or negative current.

Video on "Reluctance":

https://www.coursera.org/learn/electronic-converters/lecture/8MPtI/reluctance-and-magnetic-circuits

[synchro1]

Here we see the negative Henry value on the left, in the "Magnetic Reluctance" equation below. This value is the equivalent of Ohms in the resistance formula on the right and is a measure of magnetic field strength. Naturally, everyone knows the field resists change in current through an inductor and therefore behaves like resistance in the other formula.