# Inductive and Capacitive Reactances - AC circuits

1. Aug 31, 2009

### uzair_ha91

Question:
If we increase the driving frequency in a circuit with a purely capacitive load, do (A) amplitude Vc and (B) amplitude Ic increase, decrease or remain the same?
If instead the circuit has a purely inductive load, do (C) amplitude V L and (D) amplitude I L increase, decrease or remain the same?
Relevant Equations:
Xc= 1/wC = V/I
X L= wL = V/I
Attempt at solution:
I don't understand how to apply there equations here to get the answer...So please tell me how to find the answer here... And also can you tell me whether there is a link between this question and this https://www.physicsforums.com/showthread.php?t=333786&goto=newpost (which i recently posted) ?

2. Aug 31, 2009

### rock.freak667

let's re-simplify some things:

Inductance (you can assume this is as resistance for the time) of a capacitor XC=1/(2πfC)

For an inductor XL=2πfL

Can you find expressions for the Voltage and current through the capacitor and inductor?

3. Aug 31, 2009

### uzair_ha91

Vc= Ic x Xc
V L=I L x X L

4. Aug 31, 2009

### Staff: Mentor

Small typo -- you meant "reactance" instead of "inductance"... (if you want to fix it, I'll just delete this post of mine to clean up)