1) The Laplace force results from the circulation of a current I, in a conductor with
length L, within a magnetic field B. It is no surprise that the force is directly
proportional to these three values and is expressed with F = I x L x B. Its direction
is orthogonal to both the magnetic field as well as to the direction of current flow
and is determined using the famous "three-fingers rule" (of the right hand!).
When the thumb points in the direction of current flow and the index finger follows
the direction of the magnetic field, the middle finger is placed at a right-angle and
indicates the direction of the Laplace force.

2) By comparing this illustration with that of the electric generator, the
" reversibility " of the phenomenon will be noted. The devices are very similar:
a loop placed within a magnetic field. By passing electric current through
the circuit, rotation is obtained (motor effect). By rotating the circuit, current is
generated (generator effect).