Can anyone tell me what these formulas in electromagnetism are called?

[Ren_Hoek]

I know what $\Phi$ and B are, I think they are the magnetic flux and its density. I think $\mu$ is the permeability. But I dont know what $R_c$ and MMF are and how are these formulas deduced.

 

[Ren_Hoek]

Oh I see $R_c$ is the reluctance and MMF is magnetomotive force. I still dont know how these formulas are derived tho.

 

[Mordred]

Which reference did you get these from ? They aren't in the usual standard form.

 

[berkeman]

View attachment 347806View attachment 347807
I know what $\Phi$ and B are, I think they are the magnetic flux and its density. I think $\mu$ is the permeability. But I dont know what $R_c$ and MMF are and how are these formulas deduced.

Since you seem to know how to use LaTeX, is there a reason you did not post those equations you are asking about using LaTeX instead of those fuzzy images?

 

[Ren_Hoek]

Since you seem to know how to use LaTeX, is there a reason you did not post those equations you are asking about using LaTeX instead of those fuzzy images?

oh it's others' hand script

 

[renormalize]

oh it's others' hand script

Maybe so, but if you can read it, you can also enter it in LaTeX to benefit the rest of us.