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The minimum capacitance of a variable capacitor in a radio is 4.12pF

Part A What is the inductance of a coil connected to this capacitor if the oscillation frequency of the L-C circuit is 1.68MHz MHZ , corresponding to one end of the AM radio broadcast band, when the capacitor is set to its minimum capacitance.

Part B The frequency at the other end of the broadcast band is 0.538MHz . What is the maximum capacitance of the capacitor if the oscillation frequency is adjustable over the range of the broadcast band?

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