I was reading about the idea of using an electrodynamic tether to generate electricity for satellites in Earth's orbit using the planet's magnetic field, generating electricity but gradually lowering the satellite's orbit in the process. I had the idea to use a similar device on Europa, using it's motion through Jupiter's magnetic field.
Jupiter has a magnetic field much stronger than earth, with a magnetic moment 18,000 times higher, the moon Europa is well within the influence of this field. So presumably a conducting tether placed on Europa, which is orbiting at 13,743m/s on average with respect to Jupiter would convert some tiny fraction of Europa's virtually unlimited orbital kinetic energy into electricity which could then be used to power a lander, rover, or potentially some kind of heated "drill" designed to melt through the ice.
My questions are 1) is this actually possible? and 2) Could a useable amount of electricity be generated in this way, with present material limitations?, or would the tether have to be either too massive, long or superconductive in order to generate useful electricity?