Question

To reduce the resonant frequency in an LCR 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

Another capacitor should be added in parallel to the first.

Explanation - 

Resonant frequency, `f = 1/(2pi) sqrt(Le)` i.e, `f ∝ 1/sqrtc` so to

In an LCR series circuit with a generator, another capacitor should be connected in parallel to the first capacitor to lower the resonant frequency.