Tag: magnetism

Questions Related to 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

physics magnetism and matter paramagnetic material classification of magnetic material magnetism

  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

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Correct Option: C
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.

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. 

physics magnetism and matter paramagnetic material classification of magnetic material magnetism

  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

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Correct Option: D

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.

physics magnetism and matter paramagnetic material classification of magnetic material magnetism

  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

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Correct Option: C

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

physics magnetism and matter paramagnetic material classification of magnetic material magnetism

  1. anti-ferromagnetic

  2. paramagnetic

  3. diamagnetic

  4. non-magnetic

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Correct Option: B
Explanation:

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

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

physics magnetism and matter paramagnetic material classification of magnetic material magnetism

  1. diamagnetics

  2. paramagnetics

  3. ferromagnetics

  4. antimagnetics

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Correct Option: B
Explanation:

In paramagnetic metals, magnetism is acquired by orientation of atomic magnetic  dipoles.

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

physics magnetism and matter paramagnetic material classification of magnetic material magnetism

  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

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Correct Option: A
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.

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 :

physics magnetism and matter paramagnetic material classification of magnetic material magnetism

  1. Same

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

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

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

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Correct Option: D

Magnetically aligned atoms in a magnetic material forms a cluster. The cluster is called a:

physics magnetism and matter paramagnetic material classification of magnetic material magnetism

  1. Domain

  2. Molecule

  3. Pole

  4. Charge

  5. Electron cloud

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Correct Option: A
Explanation:

Each atom has its own magnetic field, and if a group of atoms can align their magnetic fields, this group or cluster of atoms is called a magnetic domain. 

Magnetic permeability of paramagnetic substances is?

physics magnetism and matter paramagnetic material classification of magnetic material magnetism

  1. $0$

  2. $> 1$

  3. $< 1$

  4. $1$

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Correct Option: B
Explanation:

Paramagnetic substances are substances which are weakly attracted by the magnetic field when they are placed in an external magnetic field. Magnetic permeability of paramagnetic substances is slightly greater than one whereas that of diamagnetic materials is slightly less than one.

What is not true about paramagnetic substances?

physics magnetism and matter paramagnetic material classification of magnetic material magnetism

  1. When freely suspended in a uniform magnetic field, they align themselves parallel to the magnetic field

  2. The magnetic susceptibility of paramagnetic substances has a small negative value

  3. Para-magnetism is temperature dependent

  4. They are feebly attracted by a magnet

Show answer
Correct Option: B