These two statements are sometimes
called the‘first laws magnetism’and
are shown Fig.13 and 5. Strong magnetic fields have high-flux
density. 5. The magnetic fields around
a permanent magnet are shown Figs 5.14. The number lines magnetic flux within magnetic field a
measure the flux density. Like poles repel; unlike poles attract.
Definition
The region space through which
the influence magnet can be
detected called the magnetic field of
that magnet. Lines magnetic flux travel along magnetic material and always
emerge out the ‘north pole’ end the magnet.
Definition
The places magnetic material
where the lines flux are concen-
trated are called the magnetic poles. The region space through which the influence magnet can
be detected called the magnetic field that magnet. Lines magnetic flux pass through space and non-magnetic
materials undisturbed. 5.
10. The places magnetic material where the lines flux are con-
centrated are called the magnetic poles.
Bar magnet Horse shoe magnet
N S
N S
FIGURE 5. Gently
tapping the paper then causes the filings take the shape the mag-
netic field surrounding the permanent magnet. The symbol used for flux density and the unit flux
density the tesla (symbol T), commemorate the work the
Croatian-born American physicist Nikola Tesla (1857–1943). These two statements are
sometimes called the ‘first laws magnetism’ and are shown in
Fig.
.
4. Lines magnetic flux behave like stretched elastic bands, always
trying shorten themselves.14.Basic scientific concepts electrotechnology
113
3.
Magnetic fields
If permanent magnet placed surface and covered piece of
paper, iron filings can shaken the paper from dispenser.
8.
6.
5. Lines magnetic flux never cross over each other.
9.14.
Definition
Like poles repel; unlike poles attract.
7.13
Magnetic fields around permanent magnet
