[ExI] Physicist proposes using magnetic fields to produce gravitational fields?

[Adrian Tymes]

On Sat, Jan 9, 2016 at 1:00 AM, Anders Sandberg <anders at aleph.se> wrote:

> In the end this is likely the wrong way of making gravity. You could use
> the energy to spin stuff up or move masses around. Electrical fields get
> their energy divided by a c^2 factor when calculating their gravity effect,
> so mass is way more effective in making gravity.
>

Except that you then have to move that mass around.  In a superconductor,
once the energy is invested it stays invested, so you can sustain the
gravity field without having to put more energy in to decelerate or change
course.  (If it was a large enough effect to matter.)
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