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Homework Help: Could someone pls check my answer

  1. Apr 6, 2004 #1
    Dear all,

    could someone pls check my 2 answers, if they're correct?

    thanks

    An inductor has a reactance of at 9.0E1 Hz. Answer the following questions:
    All answers must have three significant digits unless otherwise specified.

    (a)What is its inductance? (Unit: H)

    answer:

    X(L) = wL

    L = 99 / (2 * (pie) * 90)

    = 0.175H

    (b) What is its reactance at 1.3E2 Hz? (Unit: ohm)

    answer:

    X(L) = wL
    = (2 * pie * 1.3E2) (0.175)
    = 143 ohm

    thanks again
    cseet
     
  2. jcsd
  3. Apr 6, 2004 #2

    Janitor

    User Avatar
    Science Advisor

    Did you omit a number?

    Did you mean to say, "a reactance of ______ at 90 Hz"?
     
  4. Apr 6, 2004 #3
    Sorry,
    it's 99 ohm at 90Hz

    thanks
    cseet
     
  5. Apr 6, 2004 #4

    Janitor

    User Avatar
    Science Advisor

    Both of your answers look good to me.
     
  6. Apr 6, 2004 #5
    Thanks ALOT Janitor!
     
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