Magnetic Susceptibility

Q.

What is Curie Temperature?

Q.

Why $[\mathrm{Co}{\left(\mathrm{CN}\right)}_6{]}^{3-}$ is diamagnetic but $[\mathrm{Mn}{\left(\mathrm{CN}\right)}_6{]}^{3-}$ is paramagnetic?

Q.

The magnetic susceptibility is negative for

1. Diamagnetic material only

2. Paramagnetic material

3. Ferromagnetic material

4. Paramagnetic and ferromagnetic material

Q. ►The $x-\frac{1}{T}$ graph for an alloy of paramagnetic nature is shown in Fig. The curie constant is, then

1. $570K$
2. $17.5\times {10}^{-3}K$
3. $57K$
4. $2.8\times {10}^{-3}K$

Q.

Why is ${\mathrm{B}}_2$ paramagnetic while ${\mathrm{C}}_2$ is diamagnetic?

Q.

The susceptibility of magnesium at 300 K is 1.2 $\times {10}^{-5}$. At what temperature will the susceptibility increase to 1.8 $\times {10}^{-5}$ ?

Q.

10 Differences b/w paramagnetic Diamagnetic & ferromagnetic

Q. Match List - I with List - II :

	List - I		List - II
(a)	Magnetic Induction	(i)	$M{L}^2{T}^{-2}{A}^{-1}$
(b)	Magnetic Flux	(ii)	$M^0{L}^{-1}A$
(c)	Magnetic Permeability	(iii)	$M{T}^{-2}{A}^{-1}$
(d)	Magnetization	(iv)	$ML{T}^{-2}{A}^{-2}$

Choose the most appropriate answer from the options given below:

1. $\left(a\right)-\left(iii\right),\left(b\right)-\left(i\right),\left(c\right)-\left(iv\right),\left(d\right)-\left(ii\right)$
2. $\left(a\right)-\left(iii\right),\left(b\right)-\left(ii\right),\left(c\right)-\left(iv\right),\left(d\right)-\left(i\right)$
3. $\left(a\right)-\left(ii\right),\left(b\right)-\left(iv\right),\left(c\right)-\left(i\right),\left(d\right)-\left(iii\right)$
4. $\left(a\right)-\left(ii\right),\left(b\right)-\left(i\right),\left(c\right)-\left(iv\right),\left(d\right)-\left(iii\right)$

Q. A paramagnetic material has ${10}^{28}atoms/m^3$. Its magnetic susceptibility at temperature $350K$ is $2.8\times {10}^{-4}$. Its susceptibility at $300K$ is:

1. $3.726\times {10}^{-4}$
2. $2.672\times {10}^{-4}$
3. $3.267\times {10}^{-4}$
4. $3.672\times {10}^{-4}$

Q. Bohr magneton is given by (symbols have their usualmeanings)

Q.

What happens, when a magnetic substance is heated?

1. Remains the same.

2. It loses its magnetism.

3. It becomes a strong magnet.

4. It does not affect magnetism.

Q. The susceptibility of a paramagnetic material is $99$. The permeability of the material in $\text{Wb/A-m}$ is
[Permeability of free space ${\mu }_0=4\pi \times {10}^{-7}\text{Wb/A-m}$]

1. $4\pi \times {10}^{-7}$
2. $4\pi \times {10}^{-6}$
3. $4\pi \times {10}^{-5}$
4. $4\pi \times {10}^{-4}$

Q. A sensitive magnetic instrument can be shielded very effectively from outside magnetic fields by placing it inside a box of

1. Teak wood
2. Plastic material
3. Soft iron of high permeability
4. A metal of high conductivity

Q.

The magnetic field B and the magnetic intensity H in a material are found to be 1.6 T and 1000 A $m^{-1}$ respectively. Calculate the relative permeability ${\mu }_r$ and the susceptibility x of the material.

Q.

Which of the following is correct?
(symbols have the usual meaning)

1. $H=\chi M$

2. ${\mu }_0=1+\chi$

3. ${\mu }_r=1+\chi$

4. $B={\mu }_{0}H+M$

Q. The correct measure of magnetic hardness of a material is,

1. permanent magnetism
2. Hysteresis loss
3. Coercivity
4. retentivity

Q.

The susceptibility of annealed iron at saturation is 5500. Find the permeability of annealed iron at saturation

Q.

A Muon is a particle that has the same charge as an electron but is 200 times heavier than it . if we had an atoms in which the muon revolves around a Proton instead of an electron what would be the value of magnetic moment of the muon in the ground state of such an atom

Q.

Which of the following is more paramagnetic?

1. ${\mathrm{Fe}}^{2+}$

2. ${\mathrm{Fe}}^{3+}$

3. ${\mathrm{Cr}}^{3+}$

4. ${\mathrm{Mn}}^{3+}$

Q. The curie point of cobalt is 1100°c- what is meant by this?

Q. The unit for molar susceptibility is

1. $kg-m^{-3}$
2. $k{g}^{-1}-m^3$
3. $m^3$
4. $Nounits$

Q.

In MICR, what does C stands for

Q.

The magnetic susceptibility is negative for___?

1. Diamagnetic material only

2. Paramagnetic material

3. Ferromagnetic material

4. Paramagnetic and ferromagnetic material

Q.

What do you mean by magnetic susceptibility?

Q. An iron rod of $0.2c{m}^2$ cross - sectional area is subjected to a magnetizing field of $1200A{m}^{-1}$. The susceptibility of iron is 599. The magnetic flux produced is :

1. $0.904Wb$
2. $5.43\times {10}^{-5}Wb$
3. $1.81\times {10}^{-5}Wb$
4. $0.904\times {10}^{-5}Wb$

Q. The dipole moment of each molecule of a paramagnetic gas is $1.5\times {10}^{-23}amp\times m^2$. The temperature of gas is ${27}^{\circ }$ C and the number of molecules per unit volume in it is $2\times {10}^{26}{m}^{–3}$. The maximum possible intensity of magnetisation in the gas will be

1. $3\times {10}^{3}amp/m$
   
2. $6\times {10}^{-4}amp/m$
   
3. $4\times {10}^{-3}amp/m$
   
4. $5\times {10}^{5}amp/m$
   

Q. An iron rod of susceptibility $599$ is subjected to a magnetizing field of $1200{\text{Am}}^{-1}$. The permeability of the material of the rod is :

Take, ${\mu }_0=4\pi \times {10}^{-7}{\text{TmA}}^{-1}$

1. $2.4\pi \times {10}^{-4}{\text{TmA}}^{-1}$
2. $2.4\pi \times {10}^{-7}{\text{TmA}}^{-1}$
3. $2.4\pi \times {10}^{-5}{\text{TmA}}^{-1}$
4. $2.4\pi \times {10}^{-3}{\text{TmA}}^{-1}$

Q. With a standard rectangular bar magnet the time period of a vibration magnetometer is 4s. The bar magnet is cut parallel to its length into four equal pieces. The time period of vibration magnetometer when one piece is used (in second) (bar magnet breadth is small) is :

1. 16
2. 8
3. 4
4. 2

Q. Assertion : The product of magnetic susceptibility and absolute temperature for a paramagnetic substance is constant.
Reason : Susceptibility is positive but very small for paramagnetic substance.

1. If assertion is true but reason is false.
2. If both assertion and reason are true and reason is the correct explanation of assertion.
3. If both assertion and reason are true and reason is not the correct explanation of assertion.
4. If both assertion and reason are false

Q. The $\chi -\left(\frac{1}{T}\right)$ graph for an alloy of paramagnetic nature is shown in figure. The curie constant is, then

1. $57K$
2. $2.8\times {10}^{-3}K$
3. $570K$
4. $17.5\times {10}^{-3}K$