Question -
Answer -
The range of frequency (ν) of aradio is 800 kHz to 1200 kHz.
Lower tuning frequency, ν1 =800 kHz = 800 × 103 Hz
Upper tuning frequency, ν2 =1200 kHz = 1200× 103 Hz
Effective inductance ofcircuit L = 200 μH = 200 × 10−6 H
Capacitanceof variable capacitor for ν1 is given as:C1
Where,
ω1 = Angularfrequency for capacitor C1
Capacitance of variable capacitorfor ν2,
C2 
Where,
ω2 = Angularfrequency for capacitor C2
Hence, the range of the variablecapacitor is from 88.04 pF to 198.1 pF.