Tag: magnetism and matter

Questions Related to magnetism and matter

Substances in which the magnetic moment of a

single atom is not-zero

physics magnetism and matter paramagnetic material classification of magnetic material magnetism

  1. diamagnetic

  2. ferromagnetic

  3. paramagnetic

  4. electromagnetic

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Correct Option: C

An atom is paramagnetic if it has :

physics magnetism and matter paramagnetic material classification of magnetic material magnetism

  1. an electric dipole moment

  2. no magnetic moment

  3. a magnetic moment

  4. no electric dipole moment

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Correct Option: A

A paramagnetic substance when placed in an externally applied non-uniform magnetic field tends to ___________.

physics magnetism and matter paramagnetic material classification of magnetic material magnetism

  1. increase the applied field

  2. decrease the applied field

  3. vary the applied field

  4. change the applied field

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Correct Option: A
Explanation:

Paramagnetic substances are the substances which are feebly attracted by a magnet. When a non-uniform external magnetic field is applied to a paramagnetic substance the magnetic field tries to aligned the magnetic moment in the direction of the field 

Completely alignment is however not possible, on account of thermal vibration. A better allingement can be achieved by increasing the strength of the applied magnetic field.

 

When the atomic magnetic moments are randomly oriented in a solid its magnetic behavior is termed as

physics magnetism and matter paramagnetic material classification of magnetic material magnetism

  1. semi-magnetic.

  2. anti-ferromagnetic.

  3. paramagnetic.

  4. poly crystalline.

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Correct Option: C
Explanation:

When the atomic magnetic moments are randomly oriented in a solid its magnetic behavior is termed as paramagnetic.in paramagnetism electrons are unpaired.

Liquid oxygen remains suspended between two pole forces of a magnet because it is:

physics magnetism and matter paramagnetic material classification of magnetic material magnetism

  1. diamagnetic

  2. paramagnetic

  3. ferromagnetic

  4. antiferromagnetic

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Correct Option: B
Explanation:

Oxygen is paramagnetic in nature. So if it will be attracted both by North pole or South pole. When it is placed exactly between two magnetic poles, the forces acting on it due to magnetic poles will be equal & opposite. Hence it will remain suspended between them.

A substance is placed in a non uniform magnetic field. It experiences weak force towards the strong field. The substance is _________ type.

physics magnetism and matter paramagnetic material classification of magnetic material magnetism

  1. Ferromagnetic

  2. Diamagnetic

  3. Paramagnetic

  4. None of these

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Correct Option: C
Explanation:

Paramagnetic substance has the property that when they are placed in an external magnetic field, they get weakly magnetised in the same direction as that of external magnetic field and are weakly attracted by the external magnetic field.
So, correct answer is option C.

Mark the correct set of ferromagnetic substances,

physics magnetism and matter magnetic materials behaviour of substances in magnetic field classification of magnetic materials

  1. iron, cobalt and nickel

  2. iron, copper and lead

  3. silicon, bismuth and nickel

  4. aluminium, sodium and copper.

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Correct Option: A
Explanation:

Iron, cobalt and nickel are the examples of ferromagnetic material.

Nickel shows ferromagnetic property at room temperature. If the temperature is increased beyond Curie temperature, then it will show the

physics magnetism and matter magnetic materials behaviour of substances in magnetic field classification of magnetic materials

  1. anti ferromagnetism

  2. no magnetic property

  3. diamagnetism

  4. paramagnetism

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Correct Option: D
Explanation:

Above Curie temperature, ferromagnetic material become paramagnetic.

Assertion : When diamagnetic material is placed in a non-uniform magnetic field, it tends to move from stronger to the weaker part of the magnetic field.
Reason : Diamagnetic materials possess strong magnetism.

physics magnetism and matter magnetic materials behaviour of substances in magnetic field classification of magnetic materials

  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:

Electrons is an atom orbiting around nucleus possess orbital angular momentum. These orbiting electrons are equivalent to current-carrying loop and thus possess orbital magnetic moment. Diamagnetic substances are the ones in which resultant magnetic moment in an atom is zero. When magnetic field is applied, those electrons having orbital magnetic moment in the same direction slow down and those in the opposite direction speed up. Thus, the substance develops a net magnetic moment in direction opposite to that of the applied field.

Assertion : At high temperature, a ferromagnet becomes a paramagnet.
Reason : The ferromagnetic property depends on temperature.

physics magnetism and matter magnetic materials behaviour of substances in magnetic field classification of magnetic materials

  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.

Show answer
Correct Option: A
Explanation:

At enough high temperature, a ferromagnet become a paramagnet. The domain structure disintegrates with temperature.