Q. 11

A proton has spin and magnetic moment just like an electron. Why then its effect is neglected in magnetism of materials.

Answer :

The effect of magnetism of electron is greater than proton.

Given: The mass of proton = and the mass of electron =. To find the ratio between the magnetic moment of the proton and electron, taking the value of

Formula used:

For proton:

For electron:


L is the angular momentum; -e is the electrical charge, means mass of the electron and is the mass of proton

Explanation: Now according to classical theory an electrically charged rotating body creates dipoles, which are magnetic in nature creating opposite polarity of equal strength.

The above theory, can be applied on proton as well, now proton also has a mass like electron which is in range of Using, the formula of magnetic moment we can see that the magnetic moment and mass of proton/electron are inversely proportional.

Due to inversely proportional relationship between magnetic moment and mass, the magnetic moment is far greater than. Thereby, although it has magnetic moment but in presence of moment of electron, proton’s magnetic moment diminishes.

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