Like poles repel, unlike poles attract.
other, nor when S and S poles are presented to each other. They will
touch, however, when N and S poles are presented to each other.
(2) When unlike poles are brought close to each other, the magnetic lines
of force pass from the K pole of one magnet to the S pole of the other.
These lines of force of the two magnets join together and try to pull
the two poles together.
On the other hand, when like poles are
presented to each other, the lines of force will not join together, and
consequently develop a pushing rather than an attracting effect.
a. The flow of electrons in a conductor always produces a magnetic field. In
the wire shown in A of figure 13, current flow causes lines of force to encircle