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Calculating time constant in RC circuit

  1. May 1, 2010 #1
    I know that T = RC

    I've tried different combinations of R (not really sure what Req to take) but none of them worked. Any one can show me the right way ?
  2. jcsd
  3. May 1, 2010 #2
    Have you tried taking the Thevenin equivalent for point a to b?
  4. May 1, 2010 #3
    No I haven't and it was suggested on another forum and it worked. Thank you :)
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