From round cities to space rings

developed multiple methods of propulsion electrical forces or
other, but none of them have developed a field such a force to
Earth's gravity, which is why my opinion is that in relation to
methods of propulsion the most effective is the action and
reaction mass and as for the system best suited gravity is the
centrifugal type, do not forget that the process of biological
evolution is a great example of scientific progress in many fields
of physics and chemistry, so it is reasonable to take this into
account, but even if it were possible to have some drawbacks as
the harmful influence of those force fields over all its purpose
such interference would occur between the different fields have
on each floor of a building. You could also place an attractive
field under the city in order to generate artificial gravity, but the
serious drawback loss progressive force in each plant the more
removed the generator also would not be possible to disconnect
the force field when it was not necessary as it would with the
other system, for this reason the space centrifugal system seems
more convincing.
Regarding the use of centrifugal systems to provide surface
gravity of moons and planets I think it would be ineffective
because of the interference that would be caused by mixing
planetary gravity and centrifugal, cities would become filled
structures cylinders with sections rotating half Hour half, that
would be uncomfortable and the risk of braking caused by
gravity. Not forget that the centrifugal system in space is done by
rotating drums in the weightless environment and therefore
without the risk of braking caused by Earth's gravity. Under these
conditions it is best that the surfaces of the low-gravity worlds
magnetic systems are used to produce the attractive force required
for the movement of people. This would be achieved by placing
electromagnets or permanent magnets plates on the floor, but
slightly below it, in order to disperse magnetism. By means of
costumes provided sensitive magnetic field metal fibers it would
be achieved providing people with sufficient attractive force to be
able to walk with relative ease, this force field act primarily from
the waist down and had one on each floor in any case this system
gravity is a method of supporting a gravity system itself. This