Question

To reduce the resonant frequency in an `LCR` series circuit with a generator
A. the generator frequency should be reduced
B. another capacitor should be added in parallel to the first
C. the iron core of the inductor should be removed
D. dielectric in the capacitor should be removed

Answer 1

Correct Answer - B
We know that resonant frequency in an L-C-R circuit is given by
`underset(o)(nu)` = 1/`2pi``sqrt LC`
Now to reduce `underset(o)()` either we can increase L or we can increase C. To increase capacitance , we must connected another capacitor parallel to the first.