The basic principle involves 3 dimensions. If a magnetic field has a direction straight up from a table top and a straight wire is placed in a north south direction on the table top then moving the wire in a east west direction will cause a voltage to appear on the ends of the wire.
A...
I've had some arguments after I assumed ( perhaps wrongly) that electric fields were responsible for the direction that branches grow in. In any case my inquires on this all result in the same answers. That the direction of growth is determined by light and gravity. Do all you agree with...