Advertisements
Advertisements
Question
Distinguish between ‘paramagnetic’ and ‘ferromagnetic’ substances.
Advertisements
Solution
| Sr. No. | Paramagnetic | Ferromagnetic |
| 1. | Substances which are weakly attracted by a magnet are called paramagnetic substances. | Substances which are strongly attracted by a magnet are called ferromagnetic substances. |
| 2. | 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 the external field and hence can be used to make permanent magnets. |
| 3. | The susceptibility is positive but small. | The susceptibility is positive but very high. |
| 4. | In the absence of an electric field, the net dipole moment is zero. | In the absence of an electric field, the net dipole moment is non-zero. |
| 5. | 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. |
APPEARS IN
RELATED QUESTIONS
Which of the following substances is ductile?
Give any ‘two’ points of differences between diamagnetic and ferromagnetic substances.
In what way is the behaviour of a diamagnetic material different from that of a paramagnetic, when kept in an external magnetic field?
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)
The susceptibility of a magnetic material is 0·9853. Identify the type of magnetic material. Draw the modification of the field pattern on keeping a piece of this material in a uniform magnetic field.
Which of the following substances are para-magnetic?
Bi, Al, Cu, Ca, Pb, Ni
The magnetic susceptibility of platinum is 0.0001. It's relative permeability is:
Answer the following question.
Write three points of differences between para-, dia- and ferromagnetic materials, giving one example for each.
Identify the following magnetic materials :
What happens to a ferromagnetic material when its temperature increases above curie temperature?
Answer in brief.
Discuss the Curie law for paramagnetic material.
There are three needles 'N1', 'N2' and 'N3' made of a ferromagnetic, a paramagnetic and a diamagnetic substance respectively. When a magnet is brought close to them, then it will ____________.
The magnetic property of magnetic substance is associated with ____________.
The product of magnetic susceptibility (`chi`) and absolute temperature (T) is constant for a ____________.
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 ____________.
Why is diamagnetism, in contrast, almost independent of temperature?
What kind of ferromagnetic material is used for coating magnetic tapes in a cassette player, or for building ‘memory stores’ in a modern computer?
A certain region of space is to be shielded from magnetic fields. Suggest a method.
A Rowland ring of mean radius 15 cm has 3500 turns of wire wound on a ferromagnetic core of relative permeability 800. What is the magnetic field B in the core for a magnetising current of 1.2 A?
Nickel shows ferromagnetic property at room temperature. If the temperature is increased beyond curie temperature, then it will show ______.
Assertion: A paramagnetic sample display greater magnetisation (for the same magnetic field) when cooled.
Reason: The magnetisation does not depend on temperature.
Metals getting magnetised by orientation of atomic magnetic moments in external magnetic field are called ______.
Two identical bar magnets are fixed with their centres at a distance d apart. A stationary charge Q is placed at P in between the gap of the two magnets at a distance D from the centre O as shown in the figure. The force on the charge Q is ______.
Most of the substance show which of the magnetic property:-
If a charged particle at rest experience no electromagnetic force
Essential difference between electrostatic shielding by a conducting shell and magnetostatic shielding is due to ______.
- electrostatic field lines can end on charges and conductors have free charges.
- lines of B can also end but conductors cannot end them.
- lines of B cannot end on any material and perfect shielding is not possible.
- shells of high permeability materials can be used to divert lines of B from the interior region.
A permanent magnet in the shape of a thin cylinder of length 10 cm has M = 106 A/m. Calculate the magnetisation current IM.
Explain quantitatively the order of magnitude difference between the diamagnetic susceptibility of N2 (~5 × 10–9) (at STP) and Cu (~10–5).
A uniform magnetic field gets modified as shown in figure when two specimens A and B are placed in it.
 |
 |
| (a) | (b) |
- Identify the specimen A and B.
- How is the magnetic susceptibility of specimen A different from that of specimen B?
Which of the following has a permeability less than that of free space?
Which of the following cannot modify an external magnetic field as shown in the figure?
What is magnetic hysterisis?
State the dimensions of magnetization.
Explain the Domain theory in brief.
Which substances are feebly magnetised in a direction opposite to that of the magnetising field?
Which substances are feebly magnetised in the direction of the magnetising field?
On what basis are materials broadly classified into diamagnetic, paramagnetic, and ferromagnetic groups?
What is the susceptibility of diamagnetic substances?
What is the susceptibility of paramagnetic substances?
How do diamagnetic substances respond to a magnetic field?
Which list contains only examples of ferromagnetic substances?
How does the magnetic susceptibility of a paramagnetic material vary with its absolute temperature under Curie's Law?
What happens to paramagnetic substances on cooling at the Curie temperature?
How are the tiny domains oriented in an unmagnetised ferromagnetic specimen?
In the small-arrows analogy for ferromagnets, when does the total effect become strong?
