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Magnetic Field
Magnetic Field
Magnetic Field 🧲
Definition of Magnetic Field:
It is the region around a magnet or electric current where magnetic forces are exerted.
Properties of Field Lines:
- They emerge from the north pole and enter the south pole
- They never intersect
- Their density indicates the field strength
Types of Magnetic Fields:
- Natural field (like Earth's)
- Artificial permanent field (magnetized iron)
- Temporary electric field (solenoid)
Practical Applications:
- Electric motors
- Magnetic Resonance Imaging (MRI) devices
- Credit cards
- Maglev trains
Information
The ancient Greeks knew about magnetism in 600 BC by discovering the natural metal called magnetite
which attracts iron, and they proved that iron itself becomes capable of attracting other iron pieces when in contact with this metal
meaning it becomes magnetized. Later, in the 11th century, the Chinese used magnets to make compass needles.
A compass needle that can rotate freely around a vertical axis tends to align with the magnetic north-south due to the Earth's magnetic field
which originates in the Earth's core as a result of processes occurring in its liquid core.
The general idea that the Earth is a huge magnet appeared
with William Gilbert during his work at the court of Queen Elizabeth I of England in 1600.
The magnetic field is represented by imaginary lines called magnetic field lines
The easiest way to determine the direction of the field line at any point near a magnet
is to place a small compass at that point
so the compass needle settles with its north pole pointing toward the magnet's south pole and its south pole toward the magnet's north pole
and its axis aligns with the direction of the field line.
Magnetic Field and Field Lines
Magnetic Field and Field Lines of Two Magnets
1. Definition of Magnetic Field
Magnetic field is the region around a magnet where materials show magnetic force effects. It is symbolized by the letter (B) and its unit is Tesla (T).
2. Magnetic Field Lines
- They emerge from the north pole and enter the south pole.
- They never intersect.
- Their density is proportional to the field strength.
- For two magnets:
- If opposite poles face each other (north-south): the lines merge and form continuous paths.
- If similar poles face each other (north-north): the lines diverge and create a flux-free region.
3. Fundamental Laws
-
Gauss's Law for Magnetism:
∮B · dA = 0
(No magnetic monopoles exist)
-
Ampère's Law:
∮B · dl = μ₀ I
(Relates electric current to magnetic field)
-
Lorentz Force Law:
F = q(E + v × B)
(Force on a charge in electromagnetic field)
4. Practical Applications
- Electric motors: convert electrical energy to mechanical energy.
- Electric generators: convert mechanical energy to electrical energy.
- Magnetic Resonance Imaging (MRI): imaging internal organs.
- Maglev trains: magnetic levitation.
- Credit cards: data storage on magnetic strip.
- Speakers: convert electrical signals to vibrations.
- Transformers: change AC voltage.
Source
https://iwant2study.org/ospsg/index.php
Source
https://iwant2study.org/ospsg/index.php
Magnetic Field |
Magnetic Field 🧲
Definition of Magnetic Field:
It is the region around a magnet or electric current where magnetic forces are exerted.
Properties of Field Lines:
- They emerge from the north pole and enter the south pole
- They never intersect
- Their density indicates the field strength
Types of Magnetic Fields:
- Natural field (like Earth's)
- Artificial permanent field (magnetized iron)
- Temporary electric field (solenoid)
Practical Applications:
- Electric motors
- Magnetic Resonance Imaging (MRI) devices
- Credit cards
- Maglev trains
which attracts iron, and they proved that iron itself becomes capable of attracting other iron pieces when in contact with this metal
meaning it becomes magnetized. Later, in the 11th century, the Chinese used magnets to make compass needles.
A compass needle that can rotate freely around a vertical axis tends to align with the magnetic north-south due to the Earth's magnetic field
which originates in the Earth's core as a result of processes occurring in its liquid core.
The general idea that the Earth is a huge magnet appeared
with William Gilbert during his work at the court of Queen Elizabeth I of England in 1600. The magnetic field is represented by imaginary lines called magnetic field lines
The easiest way to determine the direction of the field line at any point near a magnet
is to place a small compass at that point
so the compass needle settles with its north pole pointing toward the magnet's south pole and its south pole toward the magnet's north pole
and its axis aligns with the direction of the field line.
Magnetic Field and Field Lines of Two Magnets
1. Definition of Magnetic Field
Magnetic field is the region around a magnet where materials show magnetic force effects. It is symbolized by the letter (B) and its unit is Tesla (T).
2. Magnetic Field Lines
- They emerge from the north pole and enter the south pole.
- They never intersect.
- Their density is proportional to the field strength.
- For two magnets:
- If opposite poles face each other (north-south): the lines merge and form continuous paths.
- If similar poles face each other (north-north): the lines diverge and create a flux-free region.
3. Fundamental Laws
-
Gauss's Law for Magnetism:
∮B · dA = 0
(No magnetic monopoles exist) -
Ampère's Law:
∮B · dl = μ₀ I
(Relates electric current to magnetic field) -
Lorentz Force Law:
F = q(E + v × B)
(Force on a charge in electromagnetic field)
4. Practical Applications
- Electric motors: convert electrical energy to mechanical energy.
- Electric generators: convert mechanical energy to electrical energy.
- Magnetic Resonance Imaging (MRI): imaging internal organs.
- Maglev trains: magnetic levitation.
- Credit cards: data storage on magnetic strip.
- Speakers: convert electrical signals to vibrations.
- Transformers: change AC voltage.
Source https://iwant2study.org/ospsg/index.php
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