Question

Explain the types of magnetism?

Answer 1

Diamagnetic materials are slightly repelled when placed in an external magnetic field. They get slightly magnetized but in the opposite direction to the applied magnetic field intensity and show repulsive behavior.

Complete answer:
Based on the magnetic behavior in the presence of an external magnetic field, we have three types of magnetism most commonly found in the materials: Paramagnetism, Diamagnetism, and Ferromagnetism.
Paramagnetism is characterized by the fact that these materials are slightly magnetized and attracted in the direction of an external magnetic field. Diamagnetic materials are slightly repelled in the opposite direction of an external field while ferromagnetic materials are strongly attracted in the presence of an external field.
Magnetic susceptibility is a quantity that tells us how much material gets magnetized when placed in an external magnetic field. It is defined as the ratio of magnetization (M) produced in the material and the applied magnetic field intensity (H) on the sample. Mathematical expression for susceptibility is
$\chi = \dfrac{B}{H}$
Paramagnets and Ferromagnets are attracted to the external field and therefore exhibit positive magnetic susceptibility which is higher in the case of Ferromagnets than paramagnets. But diamagnetic materials are slightly repelled in an external field. This means that diamagnetic materials exhibit almost zero or small negative susceptibility.

Note:
Diamagnetic materials have an electronic structure that produces a field in the opposite direction of the external field. These two fields repel each other leading to a negative susceptibility for diamagnetic.