# Resonance and its applications

### Explanation of question 4

A series circuit is resonant at a frequency of 4kHz. If the resistance of the circuit is doubled, the resonant frequency will be

1. 1kHz
2. 2kHz
3. 4kHz
4. 8kHz

The answer is :- 3

The resonant frequency is calculated using the equation

The resistance does not figure in this equation because it has no effect on the resonant frequency, that is determined purely by the values of L and C.

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