An RLC oscillator circuit contains a 55.0-? resistor and a 1.50-mH inductor. Wha

Question

An RLC oscillator circuit contains a 55.0-? resistor and a 1.50-mH inductor. What capacitance is necessary for the time constant of the circuit (the 1/e value) to be equal to the oscillation period?

I found this link, but I can't get the right answer (https://docs.google.com/viewer?a=v&q=cache:mqpw8qAb4tQJ:www.owlnet.rice.edu/~phys102/Lab/RLC_circuits.pdf+time+constant+rlc+circuit&hl=en&gl=in&pid=bl&srcid=ADGEESjQTfINULIEHM34xUThxVq9jzC2bUAhZNP0MX2hoqxdoh9Wza1UHCQaRARnAZnFSuoIfFpvS4qizLLAD-ylS3Kh6qV3H5u97nB_THj_2MzjnL4kaoDLdHGZd4fCLqyx3o7HWwNy&sig=AHIEtbSIsrpSw1Madc1RMMJ9I5iI70Gdgw&pli=1)

Explanation / Answer

1/RC=1/LC

So RC=LC

R^2C=L

So C=L/R^2=1.5 x 10^-3/55*55=0.49586 x 10^-6 F

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