Given a circuit with a resistive source impedance of ohms and a load impedance of ohms, you are going to include a (perfect) series choke of microhenries. At a frequency of MHz, how much attenuation will it give?

Given a circuit with a resistive source impedance of ohms and a load impedance of ohms, you are going to include a (perfect) parallel capacitor of microfarad. At a frequency of MHz, how much attenuation will it give?

You have a COTS product with mains conducted emissions compliant with CISPR 22 class B down to 150kHz. You want to use it in a military system which has a requirement for DCE01.B sea service limits, which have a limit at 50kHz of 60dBuA. There is a switchmode supply fundamental emission at this frequency which exceeds the limit by 10dB; so you add in a conventional cheap mains filter which "ought to do the trick". It doesn't; on test, the emission is worse by 10dB, not better. Why?

You have decided on a series common mode choke in a signal interface which has an output impedance to 0V of 100 ohms and connects to a cable with an average common mode impedance of 150 ohms. You're going to use a Wurth WE-SL2 500μH component which has an impedance greater than 1kohm from 400kHz to 80MHz. There's a conducted susceptibility around 15MHz at 3Vrms which disappears when you reduce the stress to 2V; your spec is 10V. Do you expect your fix to work, and if so, why?

You have a simple RS232 interface which has three lines, RXD, TXD and 0V. You're suffering from radiated emissions when this interface is connected to its cable and you've decided to use a series common mode choke arrangement. How do you configure it?

A 2n2 three-terminal component with ferrite leads shows substantially the same attenuation at 150MHz in an 18 ohm Z_L/Z_S circuit as it does in a 180 ohm circuit, as the figure shows. Why is this?