1. The problem statement, all variables and given/known data calculate R2, so the resonance is still posible ? C = 40 μF R1 = 30 ohm L = 9mH image : http://postimg.org/image/kampvczv5/ 2. Relevant equations ω = 1/sqroot(L*C) c = 1/(ω*C) XL = ω * L Z = (Z1*Z2)/(Z1+Z2) 3. The attempt at a solution My approach was to first calculate the resonance frequency ω = 1/sqroot(L*C) = 1667 s-1 than XL = ω * L ; Xc = 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 !