Distinguish Between ‘Paramagnetic’ and ‘Ferromagnetic’ Substances. - Physics


Distinguish between ‘paramagnetic’ and ‘ferromagnetic’ substances.



Paramagnetic Ferromagnetic
Substances which are weakly attracted by a magnet are called paramagnetic substances. Substances which are strongly attracted by a magnet are called ferromagnetic substances.
Paramagnetic materials lose their magnetism on removal of the external field and hence cannot be used to make permanent magnets. Ferromagnetic materials retain some magnetism on removal of external field and hence can be used to make permanent magnets.
The susceptibility is positive but small. The susceptibility is positive but very high.
In the absence of electric field, the net dipole moment is zero. In the absence of electric field, the net dipole moment is non-zero.
Aluminium, manganese, chromium and platinum are some examples of paramagnetic substances. Iron, nickel, cobalt, gadolinium, dysprosium and their alloys are some examples of ferromagnetic substances.


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2015-2016 (March)



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 0.1m2 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]  

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?

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 10-4T. 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. (μ0 = 4Π × 10−7 SI unit)

Explain Curie’s law for a paramagnetic substance.

The susceptibility of a magnetic material is − 2.6 × 10−5. Identify the type of magnetic material and state its two properties.

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 × 1026 atoms/m with atomic magnetic dipole moment of 1.5 × 10−23 A m2 each. The gas is at 27°C.

  1. Find the maximum magnetization intensity of this sample.
  2. 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 cm2 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.

Two identical bar magnets each of magnetic moment M, separated by some distance are kept perpendicular to each other. The magnetic induction at a point at the same distance d from the centre of magnets, is (µ0 = permeability of free space)

The susceptibility of a magnetic material is positive and small. The material is ______.

The magnetic susceptibility of a paramagnetic material at - 73 °C is 0.0075. Its value at -173 °C will be ______.

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

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 domain in a ferromagnetic substance is in the form of a cube of side length 1 µm. If it contains 6 x 1010 atoms and each atomic dipole has a dipole moment of 7 x 10-24 Am2, then magnetization of the domain is ____________.

The earth’s field departs from its dipole shape substantially at large distances (greater than about 30,000 km). What agencies may be responsible for this distortion?

Which graph shows the variation of magnetic susceptibility (`chi`) with magnetizing field (H) for a paramagnetic substance?

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

Assertion: The ferromagnetic substance do not obey Curie’s law.
Reason: At Curie point a ferromagnetic substance start behaving as a paramagnetic substance.

The coercivity of a small magnet where the ferromagnet gets demagnetized is 3 × 103 Am–1. The current required to be passed in a solenoid of length 10 cm and number of turns 100, so that the magnet gets demagnetized when inside the solenoid, is ______.

When the temperature of a magnetic material decreases, the magnetization ______.

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

If a diamagnetic substance is brought near north or south pole of a bar magnet, it is ______.

Of dia, para and ferromagnetism, the universal property of all substances is ______.

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 permanent magnet in the shape of a thin cylinder of length 10 cm has M = 106 A/m. Calculate the magnetisation current IM.

The relative magnetic permeability of a substance X is slightly less than unity and that of substance Y is slightly more than unity, then ______.

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.


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