
#1
Sep805, 03:41 PM

P: 1

I'm not sure what to do for this question. I have found a few things of relevancy but i'm making the problem more complex than it really is?
A leyden jar of capacitance C=10^9 farads is short circuited with a copper wire of selfinductance L=3 x 10^7 and resistance R=5x10^3 ohms. find the frequency in cycles per second (angular frequency divided by 2 Pi) of the (gradually decaying) oscillatory current.  Do i need to use these values in the form ax'' + bx' + cx = f(t). If so what is f(t) meant to represent? find the number of oscillations per efolding of the gradual decay. (i.e. in the time that the amplitude reduces from a to a/e). I'm not sure what this question means, how do the efoldings relate to this? Any help is appreciated. I'm fairly sure i could do this question if i knew the relationship. Am i missing the obvious? Thanks. Pablod 



#2
Oct705, 08:04 PM

HW Helper
P: 930

This is electrical circuit analysis. Here are the steps:
1. Draw a picture of the circuit 2. Write the differential equation associated with the circuit 3. Solve the differential equation  it will be a decaying sinusoid Have you done any circuit analysis? 



#3
Oct705, 08:10 PM

HW Helper
P: 661

Try doing what hotvette has already suggested if you haven't. 


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