Final answer:
The variable capacitor functions as the tuner in a radio, allowing the receiver to select the desired frequency.
Explanation:
The component of a radio that performs the function of the tuner is the variable capacitor. In a radio receiver, the tuner circuit resonates at a specific frequency, allowing it to respond strongly to the desired frequency while rejecting others. Variable capacitors are used to adjust the resonant frequency for tuning into different stations.
Learn more about Tuner Circuit in Radio Receiver here:
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