# March 2019 StudentZone Quiz Solution

Question 1:

Compute the resonant frequency fo for the series RLC using equation (2) and compare it to the measured value.

Answer 1:

Considering the values used for the experiments: C = 1.0 µF, L = 20mH we can compute the resonant frequency as follows:

Question 2:

Compute the magnitude and phase for the series RLC circuit when the reactive component equals the resistive component.

Answer 2:

The impedance of the series RLC circuit is defined as:

Reactive component equals the resistive component implies:

The magnitude results:

The phase is computed as follows:

Parents
• I am looking to use an RLC circuit to do EMI filtering for a pulse discharge from an IC.  I am wondering what people think of these values.  R = 1mOhm ,  L = 1mH ,C = 100uF .... Will anyone say if this is good noise filtering for a 5 volt circuit?  I am trying to preserve the integrity of the signal, while also cutting off high and low frequencies

• Hello,

The easiest way to see if the values fit your design, is to actually simulate them. LTspice offers you a pretty nice environment for this.

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