BLACK HOLES DYNAMICS (masse currents)

A moving charged particle creats an electric current which in turn induces a magnetic field around the line of movement, likewise a moving masse particle creates a masse current which in turn induces a gravitomagnetic field around the line of movement.

A rotating charged sphere creates circular electric currents that induce a magnetic field in the same way as a circular coil, A rotation masse sphere creates circular masse currents that induce a gravitomagnetic field.

When the Earth rotates, it creates circular masse currents, these masse currents induce a weak gravitomagnetic field. I did calculated the gravitomagnetic field in the Nort Pole due to the rotation of the Earth. In the same way when the black whole (disc of accretion) rotates, it creates circular masse currents, these masse currents induce a very strong gravitomagnetic field, this field tends to compress galaxies into a thin disc, this explains the shape of the galaxies. The cone like shape of the bipolar matter jets (accretion ejection) by the disc of accretion are due to the gravitomagnetic field.