Electromagnetic momentum density is defined as the cross product

```Electromagnetic momentum density is defined as the cross product of the electric field
and the magnetic field times the electric constant εo. The time derivative of this cross
product is a force density. This force density, integrated over space, represents a real
force that, under the appropriate configurations, exists within a vacuum. Forces must act
on something. The purpose of this experiment is to determine if this force, existing within
the vacuum, is acting on space itself— causing space to accelerate— and how this force
may be utilized for propulsion.
This experiment takes place within vacuum. A cylindrical capacitor, 1 m long and 2 cm
in radius, is charged with a steady 20 kv. The separation between capacitor cylinders is
1cm. A current carrying wire is passed though the mutual centers of the cylinders. The
current creates a magnetic field perpendicular to the radial electric field of the capacitors.
Using a function generator and amplifier, the current is ramped periodically between 0
and 2 A with a period of 2 μs. The result is a periodic force, existing within a vacuum,
between the capacitor cylinders acting in the direction of the wire. A laser interferometer,
with one of its laser legs passed between the capacitor cylinders, will determine if space
itself is accelerating.
We are currently in the process of building the experiment.
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