Magnetic Force
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| Magnetic Force |
Magnetic force can be defined as the
type of force which generates during the motion of charged particles. These
charged particles will attract or repulse with each other according to the type
of charge they gain. The magnetic field which surrounds the moving particles
plays an important role in helping the magnetic force to arise between the
charges of these moving particles. So, we have to recognize magnetic field at
first.
Magnetic field
 |
| Magnetic field |
We can define magnetic field as the
description of magnetic effect of moving electric charges within any magnetized
material. It’s the region that surrounds any magnet in which the attraction of
different poles of two magnets or the repulsion of similar poles of two magnets
will happen.
It is described as a vector field and
the information within this vector can be represented by the field lines that
shown in the figure. These lines haves some properties:
·
They never cross.
·
Their density is an indication of the field strength.
·
They are continuous and form closed loops within the
magnet.
·
Their direction is indicated by drawing arrowheads
along them.
Magnetic
field calculation can be done according to the next equation:
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| Magnetic field calculation |
Where,
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B: the magnetic field.
-
μ0: the permeability of free space.
-
I: Electric current.
-
R: density from the straight wire.
Magnetic Force Calculations
There are two equations that can be used for the calculation
of magnetic force. The first equation can be illustrated as follows:
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| Magnetic field calculation |
Where,
-
F: Magnetic Force.
-
B: Magnetic Field.
-
q: Charge.
-
v: Speed or Velocity of a charge.
The second equation which is used to
calculate magnetic force can be illustrated as follows:
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| calculate magnetic force second equation |
Where,
-
F: Magnetic Force.
-
I: Electric Current.
-
L: The length of the wire.
-
B: Magnetic Field.
Magnets Applications
Magnets exist everywhere in our daily
life. They are used for the manufacturing of most of the devices we use; from
small toys to large devices. Here are some important applications of magnets:
ü Magnets are used
in speakers which are found in TV, airphones, and computers for the generation
of sound. This can be done by the electromagnetic waves which are generated by
these magnets and the electric effect.
ü Countless
travelers can find their way by using compasses, these compasses use magnetic
field to make that possible.
ü Magnets are used
widely in computers. These magnets play an important role as an information
storage. The hard disc drives which are used for that reason in computers are
covered with millions of magnets. They will help the drives to process the
information as needed.
ü Very strong
magnets are used in magnetic resonance imaging (MRI) scan which is used in all
hospitals all over the world. The detailed images of the whole body which can
be produced by this scan can be analyzed by the doctors and this will
facilitate the diagnosis and treatment of patients.
ü Magnets are used
in almost all of the electronic devices which exist in houses, hospitals,
industries and even schools.
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