Magnetic Field Lines and Magnetic Field Visualize Sheet
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- publisher
- Gordon
- Issue Time
- Sep 24,2020
Summary
• Magnetic field lines are a visual representation of the invisible lines of force in a magnetic field.
• By convention, the lines trace the force from the north to south pole of a magnet.
• The distance between the lines indicates relative strength of the magnetic field. The closer the lines are, the stronger the magnetic field is.
• Iron filings and a compass may be used to trace the shape, strength, and direction of magnetic field lines.
Magnetic Field Lines and
Magnetic Field Visualize Sheet
A magnetic field surrounds any electric charge
in motion. The magnetic field is continuous and invisible, but its strength and
orientation may be represented by magnetic field lines. Ideally, magnetic field
lines or magnetic flux lines show the strength and orientation of a magnetic
field. The representation is useful because it gives people a way to view an
invisible force and because mathematical laws of physics easily accommodate the
"number" or density of field lines.
Magnetic field
lines also appear in nature. During a total solar eclipse, the lines in the
corona trace the Sun's magnetic field. Back on Earth, the lines in an aurora
indicate the path of the planet's magnetic field. In both cases, the visible
lines are glowing streams of charged particles.
Magnetic Field
Line Rules
Using magnetic
field lines to construct a map, some rules become apparent:
Magnetic field
lines never cross.
Magnetic field
lines are continuous. They form closed loops that continue all the way through
a magnetic material.
Magnetic field
lines bunch together where the magnetic field is strongest. In other words, the
density of field lines indicates magnetic field strength
How to See a Magnetic Field
Like air, a
magnetic field is invisible. You can view wind indirectly by throwing small
bits of paper into the air. Similarly, placing bits of magnetic material in a
magnetic field lets you trace its path. Easy methods include:
1) a Compass
2) Iron
Fillings
3) Magnetite
Sand
……
This article
is going to introduce magnetic field visualize sheet.
Structure of magnetic field visualize sheet
Magnetic field visualize sheet is a flexible
three-layer structure in which a capsule ink layer and a black ink layer are
printed on the back surface of a transparent PET film. There is a microcapsule
with a diameter of about 80 μm filled with flat magnetic powder and oil in the
capsule ink layer. Since the flat magnetic powder is lined up along a magnetic
field applied from the outside, the appearance of black ink in the bottom layer
Will change, and as a result, the magnetic pattern of the object placed on the sheet
will be recorded on the sheet.
The strength of the magnetic field is expressed
by the shade of the color of the sheet and shade area, but the absolute value
of the magnetic force is not known.
Vertical
magnetic field
When a vertical
magnetic field that penetrates the sheet from top to bottom is applied, the
flat magnetic powder in the microcapsules stands perpendicular to the sheet,
and the bottom layer is black.
The bright
color becomes visible through the PET film on the surface. For this reason, a
darker color is seen in a strong magnetic field, and a light color change is
seen in a weak place.
Horizontal
magnetic field
When a magnetic field is applied from the
horizontal direction of the sheet, the flat magnetic powder in the
microcapsules also becomes horizontal, covering the black ink in the bottom
layer, and the sheet changes to a brighter color. This is also the principle of
"color restoration" described later.
