Inductive Reactance

Discussion in 'Homework Help' started by alexander7, Oct 11, 2009.

  1. alexander7

    Thread Starter New Member

    Oct 11, 2009
    What alternating source voltage frequency is required to generate an inductive reactance of 10Ω in a 4 mH inductor?

    An Unknown inductor is wired to a source voltage alternating with a frequency of 120 HZ. Find the inductive reactance of the inductor if there are 240 mA of current flowing through it and 1.44 X 10-4 joules of potential energy stored inside its magnetic fiel.:confused:
  2. ATM


    Oct 8, 2009
    1. xL = 2piFL, we need to find the frequency, so we rearrange the equation to find f:

    f = xL / 2piL
    f = 10 / 2*pi*(4x10^-3)
    f = 387.89Hz

    2. For this question, you need to use the equation Energy = 0.5*L*I^2. Rearrange to find inductor value L. Then use the equation for number one to find its reactance.