###### Advertisements

###### Advertisements

The susceptibility of magnesium at 200 K is 1.8 x 10^{-5}. At what temperature will the susceptibility decrease by 6 x 10^{-6}?

###### Advertisements

#### Solution

Given,

T = 200K,

χ_{1} = 1.8 × 10^{−5}

χ_{1} - χ_{2} = 6 × 10^{-6}

To Find: Required temperature (T_{2})

Formula: χT=constatnt

Calculation :

χ_{1} - χ_{2} = 6 × 10^{-6}

χ_{2} = 1.8×10^{-5} - 0.6×10^{-5}

χ_{2 }= 1.2 ×10^{-5}

From formula,

∴χT = constant

χ_{1}T_{1} = χ_{2}T_{2}

`T_2 =(chi_1T_1)/chi_2`

`T_2=(1.8xx10^-5xx200)/(1.2xx10^-5)`

`T_2 = 300K `

The required temperature is 300 K.

#### APPEARS IN

#### RELATED QUESTIONS

Which of the following substances is ductile?

Give any ‘two’ points of differences between diamagnetic and ferromagnetic substances.

An iron rod of the area of cross-section 0.1m^{2} is subjected to a magnetizing field of 1000 A/m. Calculate the magnetic permeability of the iron rod. [Magnetic susceptibility of iron = 59.9, magnetic permeability of vacuum = 4π x 10^{-7} S. I. unit]

Distinguish between diamagnetic and paramagnetic substances

A meter gauge train is heading north with speed 54 km/hr in earth's magnetic field 3 x 10^{-4}T. The e.m.f. induced across the axle joining the wheels is ..........

(a) 0.45 mV

(b) 4.5 mV

(c) 45 mV

(d) 450 m V

The magnetic susceptibility of annealed iron at saturation is 4224. Find the permeability of

annealed iron at saturation. (μ_{0} = 4Π × 10^{−7} SI unit)

Explain Curie’s law for a paramagnetic substance.

A tangent galvanometer shows a deflection of 45° when 10 mA of current is passed through it. If the horizontal component of the earth's magnetic field is `B_H = 3.6 xx 10^-5 "T"` and radius of the coil is 10 cm, find the number of turns in the coil.

The magnetic susceptibility of platinum is 0.0001. It's relative permeability is:

Two substances A and B have their relative permeability slightly greater and slightly less than 1 respectively. What do you conclude about A and B as far as their magnetic materials are concerned?

Which of the following statements is correct for diamagnetic materials?

**Choose the correct option:**

A rectangular magnet suspended freely has a period of oscillation equal to T. Now it is broken into two equal halves (each having half of the original length) and one piece is made to oscillate freely. Its period of oscillation is T′, the ratio of T′/T is ______.

**Choose the correct option:**

A magnetising field of 360 Am^{−1} produces a magnetic flux density (B) = 0.6T in a ferromagnetic material. What is its permeability in Tm A^{−1}?

What happens to a ferromagnetic material when its temperature increases above curie temperature?

**Answer in brief.**

Discuss the Curie law for paramagnetic material.

A paramagnetic gas has 2.0 × 10^{26} atoms/m with atomic magnetic dipole moment of 1.5 × 10^{−23 }A m^{2} each. The gas is at 27°C.

- Find the maximum magnetization intensity of this sample.
- If the gas in this problem is kept in a uniform magnetic field of 3 T, is it possible to achieve saturation magnetization? Why?

The susceptibility of a paramagnetic material is χ at 27° C. At what temperature its susceptibility be χ/3?

A rod of magnetic material of cross-section 0.25 cm^{2} is placed in a magnetizing field of intensity 4000 A/m^{-1}. The magnetic flux passing through the rod is 25 × 10^{-6} Wb. Find out

(a) relative permeability

(b) magnetic susceptibility and

(c) magnetisation of the rod.

A domain in a ferromagnetic substance is in the form of a cube of side 1 µm. If it contains 8 × 10^{10} atoms and each atomic dipole has a dipole moment of 9 × 10^{-24} Am^{2} then the magnetisation of the domain is ______.

For a paramagnetic substance, the magnetic susceptibility is ______.

All atoms of a magnetic substance have a resultant magnetic moment even in absence of external magnetic field. The substance is ______.

Relative permittivity and permeability of a material are `epsilon_"r"` and `µ_"r"` respectively. Which of the following values of these quantities are allowed for a diamagnetic material?

The materials having negative magnetic susceptibility are ____________.

The product of magnetic susceptibility (`chi`) and absolute temperature (T) is constant for a ____________.

Above the curie temperature the susceptibility of ferromagnetic substance varies ____________.

A sphere of gold when brought towards a powerful magnet experiences ____________.

A small quantity of paramagnetic liquid is taken in a watch - glass and kept on two dissimilar magnetic poles. The liquid ____________.

A short bar magnet placed in a horizontal plane has its axis aligned along the magnetic north-south direction. Null points are found on the axis of the magnet at 14 cm from the centre of the magnet. The earth’s magnetic field at the place is 0.36 G and the angle of dip is zero. What is the total magnetic field on the normal bisector of the magnet at the same distance as the null point (i.e., 14 cm) from the centre of the magnet? (At null points, field due to a magnet is equal and opposite to the horizontal component of earth’s magnetic field.)

Why does a paramagnetic sample display greater magnetisation (for the same magnetising field) when cooled?

Why is diamagnetism, in contrast, almost independent of temperature?

Is the permeability of a ferromagnetic material independent of the magnetic field? If not, is it more for lower or higher fields?

What kind of ferromagnetic material is used for coating magnetic tapes in a cassette player, or for building ‘memory stores’ in a modern computer?

Metals getting magnetised by orientation of atomic magnetic moments in external magnetic field are called ______.

The magnetic susceptibility for diamagnetic materials is ______.

When a ferromagnetic material is created above its curie temperature

Earth's magnetic field analyses has a horizontal component except at:-

A hydrogen atom is paramagnetic. A hydrogen molecule is

For a diamagnetic material

Most of the substance show which of the magnetic property:-

If a charged particle at rest experience no electromagnetic force

The universal property of all substances is ______.

According to the Atomic theory, on heating a magnet, the thermal energy of the elementary magnet ______

A long solenoid has 1000 turns per metre and carries a current of 1 A. It has a soft iron core of µ_{r} = 1000. The core is heated beyond the Curie temperature, T_{c}.

- The H field in the solenoid is (nearly) unchanged but the B field decreases drastically.
- The H and B fields in the solenoid are nearly unchanged.
- The magnetisation in the core reverses direction.
- The magnetisation in the core diminishes by a factor of about 10
^{8}.

Magnetic susceptibility for a paramagnetic and diamagnetic materials is respectively ______.

Which of the following has a permeability less than that of free space?

What is magnetic hysterisis?

Explain ferromagnetism on the basis of the domain theory.

Explain the origin of paramagnetism on the basis of atomic structure.

State the dimensions of magnetization.

Explain the Domain theory in brief.