# Voltage across inductance ?

1. Aug 16, 2011

### raoulduke1

voltage across inductance ??

having real problems with this one, I think i got the 1st pat using w=1/(lc)^1/2

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2. Aug 16, 2011

### Zryn

Re: voltage across inductance ??

i) That formula gives the resonant frequency in radians per second, how do you get the capacitance out of it?

Have you had a go at ii) and iii)?

3. Aug 16, 2011

### raoulduke1

Re: voltage across inductance ??

i got the capacitance by manipulating the equation angular frequency=1/root(inductance x capacitance)
although im not sure if its the correct equation.

also i couldnt even make a decent effort at (ii)and (iii) i dont even no where to begin.

if you could give me an outline of how to do it ..that would be great

4. Aug 16, 2011

### Staff: Mentor

Re: voltage across inductance ??

In your coursework have you covered either impedance or reactance? What do you know about them?

5. Aug 16, 2011

### Zryn

Re: voltage across inductance ??

i) That equation looks good. Can you do the algebra and put the numbers in to get a value of capacitance?

ii) An inductor or a capacitor can both be considered as having a resistance which changes depending on the frequency of the source. As gneill commented, if you are unfamiliar with either reactance or impedance, this part of the question may be difficult for you.

Also, since the first part was about resonance, can you think of how resonance might help you?