Figure 1-17.Effects between magnetic poles.
curve of the wire. If two loops are made in the
conductor, the lines of force will circle the two loops.
In the area between the adjacent loops, the magnetic
lines are going in opposite directions. In such a case,
because they are of the same strength (from same
amount of current traveling in both loops), they cancel
each other out. The lines of force, therefore, circle the
two loops almost as though they were a single loop.
However, the magnetic field will be twice as strong
because the lines of force of the two loops combine.
When many loops of wire are formed into a coil, as
shown in figure 1-20, the lines of force of all loops
combine into a pattern that greatly resembles the
magnetic field surrounding a bar magnet. A coil of this
Figure 1-19.Electromagnetism in a wire loop.
Figure 1-20.Electromagnetism in a wire coil.