Inductance of the coil??

SAT2400

1. The problem statement, all variables and given/known data
A radio has a tuning circuit consisting of a variable capacitor and antenna coil. IF the circuit has a maximum current when C=300pF and f=40kHz, what's the inductance of the coil??


2. Relevant equations

f= 1/(2pi root (LC))



3. The attempt at a solution

L=[1/(2pi(40000))]^2 times 1/(300E-12)

But, I didn't get the answer :52.8x 10^3 was the answer;;

ehild

The right answer is 52.8x10^(-3) H.

ehild