# Resonance and its applications

### Explanation of question 10

The tuned circuit in Fig. 10.4 can be used to

1. increase the input impedance of the receiver
2. improve the receiver earth connection
3. accept a required signal
4. bypass an interfering signal

The answer is :- 4 The impedance of the series tuned circuit will be zero when at the resonant frequency. An interfering signal may therefore by-passed by adjusting the variable capacitor until the tuned circuit's resonant frequency coincides with that of the interfering signal.

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