For twisted pair wires, which of the following is a true statement:

What is the cheapest, lightest type of cable to attenuate AF interference voltages on an audio circuit induced by electric fields?

Which cable will have the greatest attenuation for interference voltages induced between the pair by low frequency magnetic fields?

What voltage will be induced in one 1mm diameter wire 50cm long by a 10mA current at 1MHz in another wire loomed against it with an insulation thickness of 1.5mm, given that they share the same ground plane and are also loomed against that?

You have to run a DC power pair and a transducer pair in the same 2m long cable with 7/0.2 untwisted wire pairs, separated by 1mm of insulation. The power comes from a switchmode supply with a quoted output ripple amplitude of 10mV at the switching frequency of 100kHz. The transducer has a high impedance input with a maximum bandwidth of 50kHz and a 6dB/octave attenuation above that, and the signal is A-D converted with a least significant bit resolution of 0.6mV. Will you need filtering to prevent the power supply affecting the resolution, if so how much, and where?

You have a DC power cable running to a 1kW DC-DC converter with a 24V input, consisting of two separate wires of about 0.5m length. You need to deal with an emissions problem at around 150MHz which you've traced to this cable. You need a quick and easy solution; and a cable ferrite looks like the answer. Do you: