Does Magnetic Field Reverse: 9 Interesting Facts


In this article, the topic, “does magnetic field reverse” with 9 interesting facts will be discussed in a brief manner and trying to clarify the topic.

The magnetic field can reverses. With the help of the study of geologic record we can easily understand that polarity of magnetic field can be reverse. The poles of the earth are withdrawn in the last years of 83 million near about 183 times.  

In the last 160 million years the earth poles of the earth are withdraw for minimum 100 times.

When sediments or lava solidify, they once and again sustain a signature of the ambient the field of the magnetic at the particular period of deposition. If a bar of a magnet in two pieces then the polarity of the magnet in each side will completely reverse.

For the small size of the particles of the magnet contain their own poles on the inner portion of the magnet.

What is magnetic reversal meaning?

The earth has two poles on its. One is Northern hemisphere and other one is Southern hemisphere. If a method the North is changed into South Pole and South Pole switch into North Pole this particular method termed as, magnetic reversal.

The term of magnetic reversal meaning when the magnetic field of the earth is changes to the turned upside down polarity. The incident of magnetic reversal is appeared for the reason of irregular intervals during the time period of geologic time.

For the incident of magnetic reversal the field of the magnetic became weaker but field of the magnetic never can be disappear from the surface of the earth. The atmosphere and magnetosphere both are protecting the surface of the earth from charged particles of the solar and also from the cosmic rays.

Although a small range of radiation from the particles can down on the surface of the earth.

Why does the magnetic field reverse?

The magnetic field reverse can cause the reason behind the weaker strength.

The incident of magnetic field reverse is takes place when the iron particles in the Earth’s turning about external core start going in the direction of the opposite side as other particles of the iron around them.

The last earth field of the magnetic reverse takes place was near about 780,000 times ago. The time period for the field of the magnetic reverse is not so particular. The incident of field of the magnetic reverse can be appearing in every 10,000 year or more than this time period and as once in a while as every 50 millions times or more.

Strong evidence in the incident of the magnetic field reverse is spreading of the seafloor. We can observe the polarity of the magnetic field of the earth is in the rocks. Seafloor spreading is appropriate evidence by which we can say that the south of the earth became the pole of the north and in the other way the North Pole became into South Pole.

How does the magnetic field reverse?

The polarity of the earth can be both normal and reverse. The meaning of the normal polarity means when the field of the magnetic south is notified on the part of the geographic South Pole.

The term of the magnetic field reverse or flipped means the method which is responsible for changing the South Pole into the North Pole and the North Pole became the South Pole. The interesting matter is the field of the magnetic may sometimes only sustain a peregrination rather than a reversal.

The force is that moves the needle of the compass. During the peregrination the field of the magnetic does not flipped but later the earth again can generate the same polarity by itself. Means, the North Pole remains North Pole and South Pole remain South Pole.

does magnetic field reverse
Image – Geomagnetic polarity during the last 5 million years (Pliocene and Quaternary, late Cenozoic Era). Dark areas denote periods where the polarity matches today’s normal polarity; light areas denote periods where that polarity is reversed; Image Credit – Wikipedia

When does the magnetic field reverse?

If the record of the geologic is studied then the record shows that, the last magnetic field of the earth is flipped near about 15 million years ago.

Magnetic field of the earth mark up into the space is most intense to the both poles north and south. The magnetic field of the earth is flipped as short time period as 10000 years and sometimes the time period can taken for flipping as long as 25 million years.

The flipping of the magnetic field of the earth is not considered as dangerous. But the magnetic field reverse incident weaker the both magnetosphere and atmosphere. For this reason the solar particles and cosmic rays can directly enter via the both magnetosphere and atmosphere which can causes problems the life of the earth if the solar particles and cosmic rays too much reach near to the surface of the earth.

Does magnetic field reverse its direction?

Earth never can be loss its magnetic field.

Yes, in the case of earth’s magnetic field reversal the direction will be reverse. The term of magnetic field reverse explaining that its direction means the North Pole of the earth is changed into South Pole, and the South Pole changed into North Pole.

The revolution of the earth is the reason of the buoyant liquid is getting up in curved trajectories, which can produce new field of the magnetic by shearing and twisting the existing magnetic field. When the magnetic field is reverse at that time the magnetic field of the earth became very weaker but the value of the magnetic field never can be disappear.

Magnetic field:-

Magnetic field can be deriving as; a situation that can be observe in the area around an electric current or a magnet by the state of a data cable capacity of the magnetic at each and every point in the area and the state of magnetic poles.

S.I. unit for the magnetic field is Newton per metre per amperes or Tesla. The dimensional formula for the field of the magnetic is, [latex] M^1T^2I^-^1[/latex].

Image – The shape of the magnetic field produced by a horseshoe magnet is revealed by the orientation of iron filings sprinkled on a piece of paper above the magnet;
Image Credit – Wikipedia

Formula of the magnetic field:-

The formula of the magnetic field is carried the constant, [latex] \mu_0[/latex]. The constant, [latex] \mu_0[/latex] define as, permeability of free area. The constant, [latex] \mu_0[/latex] value is, [latex] 4\pi \times [latex] 10^-^7 [/latex] Tesla meter per ampere.

So, the magnitude of the field of magnetic can be express as,

Magnitude of the field of magnetic = [latex] \frac{(Permeability of free area) (Current magnitude)}{2\pi (Distance)} [/latex]

[latex] B = \frac{\mu_0I}{2\pi r}[/latex]

Derivation of the formula of the magnetic field:-

B is denoted as, the magnitude of the magnetic field and unit is Tesla.

[latex] \mu_0[/latex] is denoted as, permeability of free area and unit is Tesla meter per ampere

I is denoted as, magnitude of the electric current and unit is Ampere.

r is denoted as, Distance and unit is meter.

Difference between normal and reverse magnetic field:

The major difference in between the normal magnetic field and reverse magnetic field is the meaning of the normal polarity means when the field of the magnetic south is notified on the part of the geographic South Pole and the field of the magnetic north is notified on the part of the geographic North Pole.

In the other hand the meaning of the reverse magnetic field means when the North Pole switching into South Pole and the South Pole transformed into North Pole.

How long does it take for Earth magnetic field to reverse?

The incident of magnetic reverse is not happened in one night. The earth takes times to reverse the magnetic field hundreds to thousands years.

The exact time period is unknown. Nobody can say the appropriate time for earth’s magnetic field to reverse. The time minimum take by the for flipping the magnetic field around 10 hundred years and maximum time taken by the earth for flipping the magnetic field is near about 25 million years.  

 In the departed 200 years the magnetic field of the earth is weaker for nine percent on the average of the global.

Characteristics of the magnetic field lines:-

Some major characteristics of the magnetic field lines are listed below,

  • Magnetic field lines are never split with each other.
  • The tangents which are stretched to the magnetic field lines are generate the point of the compass of the field of the magnetic.
  • Magnetic field lines are produced a loop in a closed manner.
  • The density for the magnetic force lines is directly proportional with the strength of the magnetic field.
  • Any magnets inside the magnetic field lines are goes from the direction of the South Pole to the direction of North Pole.
  • The magnetic field lines have both magnitude and direction at any portion of the field of magnetic for this particular reason the magnetic field lines are vector.
  • Magnetic field lines are pointed the direction of the field of the magnetic.
  • In the both North and South poles the magnetic field became more strong the reason behind of it is the magnetic field lines are more near dense when they placed at these poles.

When was the last time the magnetic field flipped?

The last time the magnetic field flipped about 780,000 years ago. In this particular time period earth flipped its magnetic field near about 15 times.

According to the current report of the WMM (World Magnetic Model) model, in 2020 the position of the North magnetic pole will be 86.50 degree North and 164.04 degree East, and the pole of the South is placed in the 64.07 degree South and 135.88 degree East.

Image – Magnetic declination map at sea-level for the year 2010 derived from WMM2010;
Image Credit – Wikipedia

What would happen if the north and South Pole switched?

If the North Pole and the South Pole is switched then multiple fields of the magnetic will be struggle with each other. The magnetic flipping incident can weaker protective magnetic field up to 90 percentages. The main purpose of the magnetic field in the earth is to protect the entire life from the solar particles and cosmic rays.

But in the case if the magnetic field is became weaker then the particles of the solar and cosmic rays directly comes to the surface of the earth which can causes cell damages, cancer fry of electronic circuits and also fry of electrical grids.

Conclusion:

The magnetic field of the earth is reverse just because of the churning performs likes convection, which produce electric current and for this reason magnetic field is generate as a result. This magnetic field shields most of the in habited portions of the earth from charged particles that produce from space, mainly from the sun. The field exchanges the speeding particles in the direction of the poles of the earth.

Indrani Banerjee

Hi..I am Indrani Banerjee. I completed my bachelor's degree in mechanical engineering. I am a enthusiastic person and I am a person who is positive about every aspect of life. I like to read Books and listening to music.

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