We could have just used our permanent magnet as the primary instead of the inductor. What practical advantages are there to using the inductor (an electromagnet) as the primary vs. using a permanent magnet

he kicked it 10 feet straight up into the air? i think this works.

the electric field is a “force field” around a charged object that illustrates the direction the electric force would push an imaginary 

where’s the list ? the question is incomplete

r = ρ x length / area  

ρ = r x area / length  

ρ is in ohm-meters  

in basic units, it is m³kg/s³a²  

i think this is it.