- #1

Kamen12

- 3

- 0

## Homework Statement

calculate R

_{2}, so the resonance is still posible ?

C = 40 μF

R

_{1}= 30 ohm

L = 9mH

image : http://postimg.org/image/kampvczv5/

## Homework Equations

ω = 1/sqroot(L*C)

_{c}= 1/(ω*C)

X

_{L}= ω * L

Z = (Z1*Z2)/(Z1+Z2)

## The Attempt at a Solution

My approach was to first calculate the resonance frequency ω = 1/sqroot(L*C) = 1667 s

^{-1}than

X

_{L}= ω * L ; X

_{c}= 1/(ω*C) == 15ohm, since they have to be the same to cancel out if I'm correct.

And at last got the R2 = 30ohm using the equation Z = (Z1*Z2)/(Z1+Z2) but the right answer should be R2 > 15ohm, so I don't know how to tackle this problem and I'm asking you guys for some advice/solution.

Thanks in advance !