Q of a coil/inductor

[large_ghostman]

Sorry for a very simple almost silly question. I have been looking at oscillators for a sound circuit, I have a simple maths question. When working out the Q of a coil using
Q=XL over R
What does the X stand for?

Question 2. How do you do super/subscript on here, with Latex? I would like to be able to do proper formula on here, but I cant find a sticky on using Latex.
Or is there a better way?

 

[ericgibbs]

The 'X' is the reactance of the inductor at the frequency of operation, usually resonance.

XL= 2 * pi *F * L in ohms.

XC = 1/ [2 * pi * F *C] in ohms

 

[large_ghostman]

Thank you Eric, the way it was written in the book, confused me! reactance seems obvious once its pointed out , my maths is taking a while to get up to speed!. Thats better my figures make sense now.
Thank you

 

[KeepItSimpleStupid]

I just found this: https://www.codecogs.com/latex/eqneditor.php

Select Latex Code from the drop-down: X_{L}

The LATEX Icon on ETO just generates the [LATEX][/LATEX] tags

Anyway, the code for [LATEX]X_{L}[/LATEX] is [LATEX]X_{L}[/LATEX]

 

[large_ghostman]

Thank you for that, I have some other questions to ask in a couple of days, will be alot easier with Latex.