# Resonance and its applications

### Explanation of question 5

A coil of inductance 125mH and resistance 2 is connected in series with a 2F capacitor. The resonant frequency of the circuit will be approximately

1. 320Hz
2. 640Hz
3. 1kHz
4. 2kHz

The answer is :- 1

The frequency of resonance can be calculated by the equation

= 320Hz, note that the dc resistance of the coil has no bearing on the resonant frequency

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