Definition
Like poles repel; unlike poles attract.
9. 5.
. Lines magnetic flux never cross over each other.
Definition
The places magnetic material
where the lines flux are concen-
trated are called the magnetic poles.14. Lines magnetic flux pass through space and non-magnetic
materials undisturbed. Lines magnetic flux travel along magnetic material and always
emerge out the ‘north pole’ end the magnet.
8.
These two statements are sometimes
called the‘first laws magnetism’and
are shown Fig.
5. The magnetic fields around
a permanent magnet are shown Figs 5.14.
6. 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).Basic scientific concepts electrotechnology
113
3. The number lines magnetic flux within magnetic field a
measure the flux density. The region space through which the influence magnet can
be detected called the magnetic field that magnet.
4. These two statements are
sometimes called the ‘first laws magnetism’ and are shown in
Fig.
Bar magnet Horse shoe magnet
N S
N S
FIGURE 5. Lines magnetic flux behave like stretched elastic bands, always
trying shorten themselves.13
Magnetic fields around permanent magnet.14. Strong magnetic fields have high-flux
density.13 and 5.
7.
Definition
The region space through which
the influence magnet can be
detected called the magnetic field of
that magnet. The places magnetic material where the lines flux are con-
centrated are called the magnetic poles.
10. Like poles repel; unlike poles attract. Gently
tapping the paper then causes the filings take the shape the mag-
netic field surrounding the permanent magnet. 5.
Magnetic fields
If permanent magnet placed surface and covered piece of
paper, iron filings can shaken the paper from dispenser
