Tag: classification of magnetic material

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Questions Related to classification of magnetic material

Multiple choice physics magnetism and matter paramagnetic material classification of magnetic material magnetism

Out of given paramagnetic substance (Calcium, Chromium, Oxygen and Tungsten) which substance has maximum susceptibility?

  1. Calcium

  2. Chromium

  3. Oxygen

  4. Tungsten
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Susceptibility at the standard temperature, $T=300K$

Calcium $\rightarrow 1.9\times 10^{-5}$ 
Chromium $\rightarrow 2.7\times 10^{-4}$
 Oxygen $\rightarrow 2.1\times 10^{-6}$
Tungsten $\rightarrow 6.8\times 10^{-5}$
Chromium have maximum susceptibility.
The correct option is B.

Multiple choice physics magnetism and matter paramagnetic material classification of magnetic material magnetism

A paramagnetic liquid is taken in a U-tube and arranged so that one of its limbs is kept between pole pieces of the magnet. The liquid level in the limb is

  1. goes down

  2. rises up

  3. remains same

  4. first goes down and then rise
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

When a paramagnetic liquid is taken in U-tube and one arm is placed between the poles of strong magnet, the liquid is feebly attracted by the magnet. Therefore, the level of the solution in the arm rises.

Multiple choice physics magnetism and matter paramagnetic material classification of magnetic material magnetism

The magnetic susceptibility of a paramagnetic material at $-73^0$ is $0.0075$, its value at $-173^0$C will be

  1. $0.0045$

  2. $0.0030$

  3. $0.015$

  4. $0.0075$
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation
Given,
$X=0.0075 \,\,at\,\,\, T=-73^{\circ}$
Curie's law, $X=\cfrac{C}{T}$
$X _{1} \propto \cfrac{1}{T _{1}}$
$\therefore \cfrac{X _{1}}{X _{2}}=\cfrac{T _{2}}{T _{1}}$
$X _{2}=X _{1}\times \cfrac{T _{1}}{T _{2}}=0.0075\times \cfrac{273-73}{2.73-173}=0.015$

Multiple choice physics magnetism and matter paramagnetic material classification of magnetic material magnetism

Assertion : Paramagnetic substances get weakly attracted to a magnet.
Reason : They have tendency to move from a region of strong magnetic field to weak magnetic field

  1. If both assertion and reason are true and reason is the correct explanation of assertion.

  2. If both assertion and reason are true and reason is not the correct explanation of assertion.

  3. If assertion is true but reason is false.

  4. If both assertion and reason are false
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Paramagnetic substances have tendency to move from a region of weak magnetic field to strong magnetic field i.e., they get weakly attracted to a magnet.

Multiple choice physics magnetism and matter paramagnetic material classification of magnetic material magnetism

Consider the following statements I and II.
(I) Paramagnetism is explained by domain theory 
(II) Susceptibility of a diamagnetic substance is independent of temperature.
Identify the correct choice from the following. 

  1. Both I and II are correct

  2. Both I and II are incorrect

  3. I is correct and II is incorrect.

  4. I is incorrect and II is correct
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Paramagnetism is explained by the alignment of atomic magnetic moments, not domain theory, which applies to ferromagnetism. The magnetic susceptibility of diamagnetic substances is indeed independent of temperature.

Multiple choice physics magnetism and matter paramagnetic material classification of magnetic material magnetism

Assertion(A) : Earth's magnetic field inside a closed iron box is less as compared to the outside.
Reason(R) : The magnetic permeability of iron is low.

  1. Both A, R are true and R is the correct explanation of A

  2. Both A, R are true and R is not correct explanation of A

  3. A is true R is false

  4. A is false R is true
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

The Earth's magnetic field inside a closed iron box is reduced due to magnetic shielding, which occurs because iron has high magnetic permeability, not low. Therefore, the assertion is true but the reason is false.

Multiple choice physics magnetism and matter paramagnetic material classification of magnetic material magnetism

The meniscus of a liquid contained in one of the limbs of a narrow U-tube is held electromagnet with the meniscus in line with the field. The liquid is seen to rise. This indicates that the liquid is

  1. anti-ferromagnetic

  2. paramagnetic

  3. diamagnetic

  4. non-magnetic
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Paramagnetic liquid tends to flow from region of weaker magnetic fields to stronger magnetic fields..

Multiple choice physics magnetism and matter paramagnetic material classification of magnetic material magnetism

The purpose of soft iron cylinder between the pole pieces of the horse-shoe magnet in a moving coil galvanometer is 

  1. to increase the magnetic induction in the polar

    gap

  2. to evenly distribute the magnetic lines of force

  3. to provide a radial magnetic field

  4. to reduce the magnetic flux leakage in the polar

    gap
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Soft iron cylinder is placed between the pole pieces of the horse-shoe magnet in a moving coil galvanometer to increase the magnetic induction in the polar gap. Soft iron is paramagnetic which increases magnetic induction when placed in field because atoms in soft iron align in such manner that it increases field.

Multiple choice physics magnetism and matter paramagnetic material classification of magnetic material magnetism

A bar magnet has been cut equally lengthwise and widthwise to give four equal pieces. The pole strength of each piece as compared to the pole strength of original bar magnet is :

  1. Same

  2. $\displaystyle \frac{1}{8}$

  3. $\displaystyle \frac{1}{4}$

  4. $\displaystyle \frac{1}{2}$
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

When a bar magnet is cut equally lengthwise and widthwise into four equal pieces, each piece has 1/4 the length and 1/2 the width of the original. Pole strength is proportional to cross-sectional area (width × thickness). Original area A = w × t. Each piece has area = (w/2) × t = A/2. Therefore pole strength of each piece is half the original pole strength.