“How do you know it will induce drag without knowing how it will be mounted?”
If it doesn’t induce drag, it won’t generate any energy. That’s how the power is extracted. No free lunch.
Only potential. Thats great in itself, and can be used to as a measure and a clock, it can act as a meter to lots of inputs but it doesn't produce any real workhorse energy, without amplification of current its pretty useless
No work gets done without current. Use this phenomena to sense a vibrating guitar string, and modulate a high power vacuum tube which regulates electron flow and Eureka! we have something of use.