What is the logic behind the rule of calculating the magnetic flux density in a magnetic field created by a circular coil, a solenoid and a straight wire? I can't understand them
![Sensors | Free Full-Text | Magnetic Flux Density Measurement Platform for an Inductive Wireless Power Transmitter Coil Design Sensors | Free Full-Text | Magnetic Flux Density Measurement Platform for an Inductive Wireless Power Transmitter Coil Design](https://www.mdpi.com/sensors/sensors-22-00479/article_deploy/html/images/sensors-22-00479-g020b.png)
Sensors | Free Full-Text | Magnetic Flux Density Measurement Platform for an Inductive Wireless Power Transmitter Coil Design
![The magnetic flux density, B Z , at various positions (Figure 3 and... | Download Scientific Diagram The magnetic flux density, B Z , at various positions (Figure 3 and... | Download Scientific Diagram](https://www.researchgate.net/profile/Philip-Harrison-4/publication/287128359/figure/fig5/AS:668872243941388@1536482978790/The-magnetic-flux-density-B-Z-at-various-positions-Figure-3-and-Table-2-is.png)
The magnetic flux density, B Z , at various positions (Figure 3 and... | Download Scientific Diagram
![Sensors | Free Full-Text | Magnetic Flux Density Measurement Platform for an Inductive Wireless Power Transmitter Coil Design Sensors | Free Full-Text | Magnetic Flux Density Measurement Platform for an Inductive Wireless Power Transmitter Coil Design](https://www.mdpi.com/sensors/sensors-22-00479/article_deploy/html/images/sensors-22-00479-g021.png)
Sensors | Free Full-Text | Magnetic Flux Density Measurement Platform for an Inductive Wireless Power Transmitter Coil Design
![The magnetic flux density measured by the Hall Effect sensors (Hs1Hs6),... | Download Scientific Diagram The magnetic flux density measured by the Hall Effect sensors (Hs1Hs6),... | Download Scientific Diagram](https://www.researchgate.net/profile/Noby-George/publication/323528795/figure/fig5/AS:700020890288138@1543909394902/The-magnetic-flux-density-measured-by-the-Hall-Effect-sensors-Hs1Hs6-when-the.png)
The magnetic flux density measured by the Hall Effect sensors (Hs1Hs6),... | Download Scientific Diagram
![Magnetic flux and magnetic flux density in weber and Tesla for beginners: from fizzics.org - YouTube Magnetic flux and magnetic flux density in weber and Tesla for beginners: from fizzics.org - YouTube](https://i.ytimg.com/vi/3NYg34_vy7k/maxresdefault.jpg)
Magnetic flux and magnetic flux density in weber and Tesla for beginners: from fizzics.org - YouTube
![Schematic diagram for the setup for measuring magnetic flux density in... | Download Scientific Diagram Schematic diagram for the setup for measuring magnetic flux density in... | Download Scientific Diagram](https://www.researchgate.net/profile/Evgeniy-Shvydkiy/publication/334552805/figure/fig1/AS:782221656989696@1563507584490/Schematic-diagram-for-the-setup-for-measuring-magnetic-flux-density-in-the-stirrer-1.png)