Question

To reduce the resonant frequency in an L-C-R series circuit with a generator ______.

Options

• the generator frequency should be reduced

• another capacitor should be added in parallel to the first

• the iron core of the inductor should be removed

• dielectric in the capacitor should be removed

Answer 1

To reduce the resonant frequency in an L-C-R series circuit with a generator another capacitor should be added in parallel to the first.

Explanation:

The resonant frequency of L-C-R series 1 circuit is f₀ = \[\frac{1}{2\pi\sqrt{LC}}\].

So to reduce resonant frequency, either we have to increase L or C.

To increase capacitance another capacitor must be connected in parallel with the first.