Magnetic Force - العلم نور

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الجمعة، 9 أغسطس 2019

Magnetic Force

Magnetic Force


Magnetic Force
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
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:
Magnetic field calculation
Magnetic field calculation

Where,
      -        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:

Magnetic field calculation
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:

calculate magnetic force second equation
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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