Magnetic Substance and Its Application

The following figure shows the variation of intensity of magnetisation $\mathrm{I}$ versus the applied magnetic field intensity $\mathrm{H}$, for two magnetic materials $\text{A}$ and $\text{B}$

Which of the material have a larger susceptibility for a given field at constant temperature?

Which one of the following species is diamagnetic in nature?

Given below are two statements: one is labelled as Assertion $\mathbf{A}$ and the other is labelled as Reason $\mathbf{R}$.
Assertion A : Electromagnets are made of soft iron.
Reason R : Soft iron has high permeability and low retentivity.
In the light of above statements, choose the most appropriate answer from the options given below.

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 magnetising field.

In the light of given statements, choose the correct answer from the options given below

Given below are two statements:

Statement I: For diamagnetic substance $-1\le \mathrm{x}<0$, where $\mathrm{x}$ is the magnetic susceptibility.

Statement II: Diamagnetic substance 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 give below.

The free space inside a current carrying toroid is filled with a material of susceptibility $2\times {10}^{-2}$. The percentage increase in the value of magnetic field inside the toroid will be
 

Consider two statements:

S1: Magnetic susceptibility of diamagnetic substance is $-1\le \chi <0$.

S2: Diamagnetic substance moves from stronger to weaker magnetic field.

Statement $-\mathrm{I}$: Electromagnets are made of soft iron

Statement $-\mathrm{II}$: Soft iron has lower permeability and high retentivity.

Choose the correct option related to statements.

The magnetic induction along the axis of an air solenoid is $0.03 \mathrm{T}$. On placing an iron core inside the solenoid, the magnetic induction becomes $15 \mathrm{T}$. The permeability of iron will be (in ${\mathrm{Wb}}^{-1} {\mathrm{A}}^{-1} {\mathrm{m}}^{-1}$)

When a piece of a magnetic substance is put in a uniform magnetic field, the flux density inside it is four times the flux density away from the piece. The magnetic permeability of the material is_______

What is a diaphragm in a telephone?

What properties should a material selected for making core of transformer and telephone diaphragms possess ?

A rod of ferromagnetic material with dimensions $10 \mathrm{cm}\times 0.5 \mathrm{cm}\times 0.2 \mathrm{cm}$ is placed in a magnetic field of strength $0.5\times {10}^4\mathrm{amp}/\mathrm{m}$ as a result of which a magnetic moment of $5\mathrm{amp}-{\mathrm{m}}^2$ is produced in the rod. If the value of magnetic induction is $3.14\times \alpha$ find $\alpha$. (in $\mathrm{SI}$ unit).

The hysteresis loss in soft magnetic materials must be kept ______

The magnetic susceptibility of a paramagnetic substance at $-173 \mathrm{℃}$ is $1.5\times {10}^{-2}$, then it's value at $-73 \mathrm{℃}$ will be:

For super conductors, magnetic susceptibility is -

Which of the materials gets repelled by a magnetic field?

Needles ${\mathit{\text{N}}}_1$, ${\mathit{\text{N}}}_2$ and ${\mathit{\text{N}}}_3$ are made of a ferromagnetic, a paramagnetic and a diamagnetic substance respectively. A magnet when brought close to them will

Magnetic moment of diamagnetic substances-

The relative permeability $\left({\mu }_r\right)$ of a ferromagnetic substance varies with temperature $\left(T\right)$ according to the curve,