Is the Calculated Inductance and Reactance Correct?

[cseet]

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

 

[Janitor]

Did you omit a number?

reactance of at 9.0E1 Hz.

Did you mean to say, "a reactance of ______ at 90 Hz"?

 

[cseet]

Sorry,
it's 99 ohm at 90Hz

thanks
cseet

 

[Janitor]

Both of your answers look good to me.

 

[cseet]

Thanks a lot Janitor!