# LC circuit oscillations

1. Apr 11, 2008

### snipaj9696

A series LC circuit contains a 100 mH inductor, a 36.0 mF capacitor and a 12 V battery. The period of the electromagnetic oscillations in the circuit is

1. 0.0227 s.

2. 1750 s.

3. 105 s.

4. 2.26 s.

5. 0.376 s.

f= 1/ 2*π *√L *C

L =100mH
C= 36uF

so,,f = 2.65

T = 1/f = 0.376S Is this correct????

2. Apr 11, 2008

### kamerling

I don't think the correct answer is there at all. The correct equation for the frequency
is: $$f = \frac {1} {2 \pi \sqrt{L C}}$$.
if you type it in ascii you should type f = 1 / (2 * pi * √(L*C)) to prevent misunderstanding. If I substitute L = 0.1 H and C = 36 * 10^(-6) F, I get f = 83.9 Hz and T = 0.0119 s

3. Apr 12, 2008

### alphysicist

In the original problem statement you have that the capacitance is 36 milliFarads, but later in your post you state that the capacitance is 36 microFarads. If the capacitance is 36 mF, then I believe your answer is correct.

4. Apr 12, 2008

### snipaj9696

I apologize the the m in the mF for 36mF is the greek letter Mu (10E-6). With that said is my answer correct?

5. Apr 12, 2008

### snipaj9696

WAIT!!! IT IS 36mF.. The m is not Mu!!!

6. Apr 12, 2008

### Kurret

may I ask what causes this electromagnetic oscilliation? never heard of it before...

7. Apr 12, 2008

### Snazzy

Well, you had listed it as uF at the very bottom, not mF.

An alternating voltage source causes the oscillation.

Last edited: Apr 12, 2008