Magnetism and Matter

The incorrect relation for a diamagnetic material (all the symbols carry their usual meaning and \(\epsilon\) is a small positive number) is :

The magnetic potential energy, when a magnetic bar of magnetic moment \(\vec{\mathrm{m}}\) is placed perpendicular to the magnetic field \(\vec{B}\) is :

[Re-NEET 2024]

An iron bar of length L has magnetic moment M. It is bent at the middle of its length such that the two arms make an angle \(60^\circ\) with each other. The magnetic moment of this new magnet is:

[NEET 2024]

The magnetic moment of an iron bar is \(\mathrm{M}\). It is now bent in such a way that it forms an arc section of a circle subtending an angle of \(60^\circ\) at the centre. The magnetic moment of this arc section is :

[Re-NEET 2024]

The magnetic potential energy, when a magnetic bar of magnetic moment \(\vec{\mathrm{m}}\) is placed perpendicular to the magnetic field \(\vec{B}\) is :

[Re-NEET 2024]

The magnetic moment of an iron bar is \(\mathrm{M}\). It is now bent in such a way that it forms an arc section of a circle subtending an angle of \(60^\circ\) at the centre. The magnetic moment of this arc section is :

[Re-NEET 2024]

Given below are two statements:
Statement-I: For diamagnetic substance \(-1\leq \chi <0\), where \(\chi\) is the magnetic susceptibility.
Statement-II: Diamagnetic substances when placed in an external magnetic field, tend to move from stronger to weaker part of the field.
In the light of the above statements, choose the correct answer from the options given below.

An iron rod of susceptibility 599 is subjected to a magnetising field of \( 1200 \mathrm{~A} \mathrm{~m}^{-1} \). The permeability of the material of the rod is \( \left(\mu_{0}=4 \pi \times 10^{-7} \mathrm{~T} \mathrm{~m} \mathrm{~A}{ }^{-1}\right) \)

[NEET 2020]

A bar magnet having a magnetic moment \(5.0A{m}^{2}\) is placed in parallel position relative to a magnetic field of 0.4T. The amount of work done in turning the magnet form parallel to antiparallel position relative to the field direction is

[JEE Main 2023, 31 Jan (Shift 1)]

Given below are two statements:
Statement-I: The diamagnetic property depends on temperature.
Statement-II: The induced magnetic dipole moment in a diamagnetic sample is always opposite to the magnetizing field.
In the light of given statement, choose the correct answer from the options given below:

[JEE Main 2023, 12 Apr (Shift 1)]

Statement-I: The ferromagnetic property depends on temperature. At high temperature, ferromagnet becomes paramagnet.

Statement-II: At high temperature, the domain wall area of a ferromagnetic substance increases.

In the light of the above statements, choose the most appropriate answer from the options given below:

[JEE Main 2021, 22 Jul (Shift 2)]

In a ferromagnetic material, below the curie temperature, a domain is defined as: