Inductance of the coil?? 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;;