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RICH DAD POOR DAD BOOK REVIEW

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  RICH  DAD  POOR  DAD  BOOK REVIEW This is amazing book.   • Explodes the myth that you need to earn a high income to become rich • Challenges the belief that your house is an asset • Shows parents why they can't rely on the school system to teach their kids about money • Defines once and for all an asset and a liability • Teaches you what to teach your kids about money for their future financial success It's been nearly 25 years since Robert Kiyosaki’s  Rich Dad Poor Dad  first made waves in the Personal Finance arena. It has since become the #1 Personal Finance book of all time... translated into dozens of languages and sold around the world. Rich Dad Poor Dad  is Robert's story of growing up with two dads — his real father and the father of his best friend, his rich dad — and the ways in which both men shaped his thoughts about money and investing. The book explodes the myth that you need to earn a high income to be rich and explains the difference between working
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What is Magnetic Materials and Classification of Magnetic Materials ?

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 What is Magnetic Material ?

The materials which get magnetized in the presence of magnetic field is called Magnetic materials.
Non Magnetic materials get magnetized in presence of magnetic field but they exhibit weak magnetization.

Classification of Magnetic Materials

On the basis of magnetic behaviour, material may be classified as
  1. Diamagnetic
  2. Paramagnetic
  3. Ferromagnetic

Diamagnetic materials

It is a weak form of magnetism that is non-persistent and persists only when an external field is applied. Due to an applied magnetic field a change is occur in the orbital motor of electrons, due to this change a magnetic moment is induced in this materials.

The magnitude of induced magnetic moment is extremely small and in a direction opposite to that of applied magnetic field.

Diamagnetic materials are repelled by magnetic field.

Some of the materials that exhibit diamagnetism are Cu, Au, Ge, Si, Diamond, Al2O3, NaCl etc.






Paramagnetic Materials

When Paramagnetic Materials placed in a magnetic field its acquire a weak magnetization in the same direction as applied field.

In some materials, permanent magnetic dipole moments of the atoms or ions are acted upon individually, with no mutual interaction upon them, (randomly distributed), this effect is called Paramagnetism.

The total dipole moment in this material and hence magnetization is zero, in absence of external field.

In the presence of magnetic field, dipoles align in the direction of field.

But in absence of field due to thermal agitation dipoles are randomly oriented.

Paramagnetic materials are attracted by external field so it moves from low intensity to high intensity of the field.




Ferromagnetic Materials

Ferromagnetism is characterized by presence of parallel alignment of permanent magnetic dipole moments in a single direction.
Examples:- Fe, Cu, Ni, Gd & Dy

Ferromagnetic materials are spontaneously magnetized even in absence of external magnetic field.

All ferromagnetic materials behave as paramagnetic materials above Curie temperature.

The ferromagnetic properties of transition elements Fe, Co, Ni are due to spin of unpaired electrons. In Fe, Co & Ni, the unpaired 3d shell e- are responsible for ferromagnetism.

When a ferromagnetic material is subjected to an external field, it follows path OA of the magnetization curve.

When magnetic field is removed, some magnetization is still in the material called as residual magnetization having remnant flux density (Br).

To reduce residual magnetization to zero, external field needs to be applied in reverse direction called as Corecive Force (Hc).




Comments

  1. UnknownAugust 20, 2020 at 1:16 PM

    Nice explanation 👌👍

    ReplyDelete
  2. Isla SophiaMarch 23, 2021 at 2:20 AM

    Thanks for writing such a good article, I stumbled onto your blog and read a few post. I like your style of writing... you can check here

    ReplyDelete
  3. adextermagJuly 9, 2021 at 5:28 PM

    You've shared some quite useful information about Magnetic. This is a fantastic opportunity for us to expand our knowledge while also being beneficial to us. Thank you for bringing this story to our attention.
    Magnetic Actuator

    ReplyDelete

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