Topic: Network Theory
When L is doubled and C is halved, the resonance frequency of series tuned circuit becomes
- A. Doubled
- B. Halved
- C. One quarter
- D. Unchanged
Answer: D. Unchanged
Explanation: The resonance frequency of a series tuned circuit is $f_{r}=\frac{1}{2\pi\sqrt{LC}}$. If L becomes $2L$ and C becomes $\frac{C}{2}$, the product $LC$ remains unchanged, thus the resonance frequency stays unchanged.