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What is the time constant for discharge of capacitors?

What is the time constant for the discharge of the capacitors in the figure (linked below)?

Please express the answer in (ms) using one significant figure.

Figure here:

http://img3.imageshack.us/img3/5921/32ex30.jpg

Thanks!

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Total resistance = 1 + 1 = 2 k ohm (R)

Total capacitance = 1/(1/2 + 1/2) = 1 micro farad (C)

Time constant = RC = 2 x 1000 x 1 x 0.000001 = 0.002 seconds

= 2 milliseconds

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