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Homework Help: Circuit inductance

  1. Apr 11, 2008 #1
    A circuit contains two inductors of 6.0 mH inductance in series placed in parallel with an inductor of 8.0 mH inductance. After one of the 6.0 mH inductors burns out, the repair person wants to replace all three inductors with one inductor of equivalent inductance. What inductance should she use?

    1. 3.0 mH

    2. 4.8 mH

    3. 3.4 mH

    4. 11 mH

    5. 20 mH

    Two 6 mH in series = L1+L2 = 6+6= 12mH
    this is in parallel with 8mH

    so,,total L = 12*8/20 = 4.8mH

    Is this correct???
  2. jcsd
  3. Apr 11, 2008 #2
    yes, it is correct. The rules for series and parallel inductances are the same as
    those for resistances.
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