360470
If a diamagnetic substance is brought near the North or the South pole of a bar magnet, it is
1 Repelled by the North pole and attracted by the South pole
2 Repelled by both the poles
3 Attracted by both the poles
4 Attracted by the North pole and repelled by the South pole
Explanation:
Diamagnetic substances are weakly magnetised in a direction opposite to that of applied magnetic field. These are repelled in an external magnetic field i.e., have a tendency to move from high to low field region, i.e., it is repelled by North and South poles of a bar magnet.
PHXII05:MAGNETISM and MATTER
360471
A thin light weight rod of diamagnetic substance such as silver is suspended in uniform external magnetic field. It will align itself with its length
1 Parallel to magnetic field
2 Perpendicular to magnetic field
3 Inclined at an angle \(45^{\circ}\) to magnetic field
4 Inclined at an angle \(120^{\circ}\) to magnetic field
Explanation:
The diamagnetic substances are those which get feebly magnetised opposite to field when placed in an external magnetic field. In uniform magnetic field, a dimagnetic substance becomes perpendicular to the field when it suspended freely.
PHXII05:MAGNETISM and MATTER
360472
Assertion : For a perfectly diamagnetic substance relative permeability is slightly less than unity. Reason : The ability of a material to permit the of passage magnetic lines of force through it is called magnetic permeability.
1 Both Assertion and Reason are correct and Reason is the correct explanation of the Assertion.
2 Both Assertion and Reason are correct but Reason is not the correct explanation of the Assertion.
3 Assertion is correct but Reason is incorrect.
4 Assertion is incorrect but reason is correct.
Explanation:
For Bismuth \(\mu_{r}=0.999834\). In diamagnetic materials all orbial electrons are pairs only \(\Rightarrow\) Vector sum of magnetic moments due to orbial motion and spin motion will be zero. They, when placed in an externel magnetic field \(\left( {{{\vec B}_{ext{\rm{ }}}}} \right)\) get feebly magnetized (in a direction opposite to \({{{\vec B}_{ext{\rm{ }}}}}\) but allow a few number of field lines of \({{{\vec B}_{ext{\rm{ }}}}}\) to pass through them. \(\mu_{r}\) is slightly less than unity (1). Reason is definition for \(\mu_{r}\). So correct option is (2).
PHXII05:MAGNETISM and MATTER
360473
A ferromagnetic material is heated above its curie temperature. The correct statement among the following is
1 Ferromagnetic domains become random.
2 Ferromagnetic domains are perfectly arranged.
3 Ferromagnetic material changes itself into diamagnetic material.
4 Ferromagnetic domains are not influenced
Explanation:
On heating, different domains have net magnetisation in them which are randomly distributed. Thus the net magnetisation of the substance due to various domains decreases to minimum.
360470
If a diamagnetic substance is brought near the North or the South pole of a bar magnet, it is
1 Repelled by the North pole and attracted by the South pole
2 Repelled by both the poles
3 Attracted by both the poles
4 Attracted by the North pole and repelled by the South pole
Explanation:
Diamagnetic substances are weakly magnetised in a direction opposite to that of applied magnetic field. These are repelled in an external magnetic field i.e., have a tendency to move from high to low field region, i.e., it is repelled by North and South poles of a bar magnet.
PHXII05:MAGNETISM and MATTER
360471
A thin light weight rod of diamagnetic substance such as silver is suspended in uniform external magnetic field. It will align itself with its length
1 Parallel to magnetic field
2 Perpendicular to magnetic field
3 Inclined at an angle \(45^{\circ}\) to magnetic field
4 Inclined at an angle \(120^{\circ}\) to magnetic field
Explanation:
The diamagnetic substances are those which get feebly magnetised opposite to field when placed in an external magnetic field. In uniform magnetic field, a dimagnetic substance becomes perpendicular to the field when it suspended freely.
PHXII05:MAGNETISM and MATTER
360472
Assertion : For a perfectly diamagnetic substance relative permeability is slightly less than unity. Reason : The ability of a material to permit the of passage magnetic lines of force through it is called magnetic permeability.
1 Both Assertion and Reason are correct and Reason is the correct explanation of the Assertion.
2 Both Assertion and Reason are correct but Reason is not the correct explanation of the Assertion.
3 Assertion is correct but Reason is incorrect.
4 Assertion is incorrect but reason is correct.
Explanation:
For Bismuth \(\mu_{r}=0.999834\). In diamagnetic materials all orbial electrons are pairs only \(\Rightarrow\) Vector sum of magnetic moments due to orbial motion and spin motion will be zero. They, when placed in an externel magnetic field \(\left( {{{\vec B}_{ext{\rm{ }}}}} \right)\) get feebly magnetized (in a direction opposite to \({{{\vec B}_{ext{\rm{ }}}}}\) but allow a few number of field lines of \({{{\vec B}_{ext{\rm{ }}}}}\) to pass through them. \(\mu_{r}\) is slightly less than unity (1). Reason is definition for \(\mu_{r}\). So correct option is (2).
PHXII05:MAGNETISM and MATTER
360473
A ferromagnetic material is heated above its curie temperature. The correct statement among the following is
1 Ferromagnetic domains become random.
2 Ferromagnetic domains are perfectly arranged.
3 Ferromagnetic material changes itself into diamagnetic material.
4 Ferromagnetic domains are not influenced
Explanation:
On heating, different domains have net magnetisation in them which are randomly distributed. Thus the net magnetisation of the substance due to various domains decreases to minimum.
360470
If a diamagnetic substance is brought near the North or the South pole of a bar magnet, it is
1 Repelled by the North pole and attracted by the South pole
2 Repelled by both the poles
3 Attracted by both the poles
4 Attracted by the North pole and repelled by the South pole
Explanation:
Diamagnetic substances are weakly magnetised in a direction opposite to that of applied magnetic field. These are repelled in an external magnetic field i.e., have a tendency to move from high to low field region, i.e., it is repelled by North and South poles of a bar magnet.
PHXII05:MAGNETISM and MATTER
360471
A thin light weight rod of diamagnetic substance such as silver is suspended in uniform external magnetic field. It will align itself with its length
1 Parallel to magnetic field
2 Perpendicular to magnetic field
3 Inclined at an angle \(45^{\circ}\) to magnetic field
4 Inclined at an angle \(120^{\circ}\) to magnetic field
Explanation:
The diamagnetic substances are those which get feebly magnetised opposite to field when placed in an external magnetic field. In uniform magnetic field, a dimagnetic substance becomes perpendicular to the field when it suspended freely.
PHXII05:MAGNETISM and MATTER
360472
Assertion : For a perfectly diamagnetic substance relative permeability is slightly less than unity. Reason : The ability of a material to permit the of passage magnetic lines of force through it is called magnetic permeability.
1 Both Assertion and Reason are correct and Reason is the correct explanation of the Assertion.
2 Both Assertion and Reason are correct but Reason is not the correct explanation of the Assertion.
3 Assertion is correct but Reason is incorrect.
4 Assertion is incorrect but reason is correct.
Explanation:
For Bismuth \(\mu_{r}=0.999834\). In diamagnetic materials all orbial electrons are pairs only \(\Rightarrow\) Vector sum of magnetic moments due to orbial motion and spin motion will be zero. They, when placed in an externel magnetic field \(\left( {{{\vec B}_{ext{\rm{ }}}}} \right)\) get feebly magnetized (in a direction opposite to \({{{\vec B}_{ext{\rm{ }}}}}\) but allow a few number of field lines of \({{{\vec B}_{ext{\rm{ }}}}}\) to pass through them. \(\mu_{r}\) is slightly less than unity (1). Reason is definition for \(\mu_{r}\). So correct option is (2).
PHXII05:MAGNETISM and MATTER
360473
A ferromagnetic material is heated above its curie temperature. The correct statement among the following is
1 Ferromagnetic domains become random.
2 Ferromagnetic domains are perfectly arranged.
3 Ferromagnetic material changes itself into diamagnetic material.
4 Ferromagnetic domains are not influenced
Explanation:
On heating, different domains have net magnetisation in them which are randomly distributed. Thus the net magnetisation of the substance due to various domains decreases to minimum.
360470
If a diamagnetic substance is brought near the North or the South pole of a bar magnet, it is
1 Repelled by the North pole and attracted by the South pole
2 Repelled by both the poles
3 Attracted by both the poles
4 Attracted by the North pole and repelled by the South pole
Explanation:
Diamagnetic substances are weakly magnetised in a direction opposite to that of applied magnetic field. These are repelled in an external magnetic field i.e., have a tendency to move from high to low field region, i.e., it is repelled by North and South poles of a bar magnet.
PHXII05:MAGNETISM and MATTER
360471
A thin light weight rod of diamagnetic substance such as silver is suspended in uniform external magnetic field. It will align itself with its length
1 Parallel to magnetic field
2 Perpendicular to magnetic field
3 Inclined at an angle \(45^{\circ}\) to magnetic field
4 Inclined at an angle \(120^{\circ}\) to magnetic field
Explanation:
The diamagnetic substances are those which get feebly magnetised opposite to field when placed in an external magnetic field. In uniform magnetic field, a dimagnetic substance becomes perpendicular to the field when it suspended freely.
PHXII05:MAGNETISM and MATTER
360472
Assertion : For a perfectly diamagnetic substance relative permeability is slightly less than unity. Reason : The ability of a material to permit the of passage magnetic lines of force through it is called magnetic permeability.
1 Both Assertion and Reason are correct and Reason is the correct explanation of the Assertion.
2 Both Assertion and Reason are correct but Reason is not the correct explanation of the Assertion.
3 Assertion is correct but Reason is incorrect.
4 Assertion is incorrect but reason is correct.
Explanation:
For Bismuth \(\mu_{r}=0.999834\). In diamagnetic materials all orbial electrons are pairs only \(\Rightarrow\) Vector sum of magnetic moments due to orbial motion and spin motion will be zero. They, when placed in an externel magnetic field \(\left( {{{\vec B}_{ext{\rm{ }}}}} \right)\) get feebly magnetized (in a direction opposite to \({{{\vec B}_{ext{\rm{ }}}}}\) but allow a few number of field lines of \({{{\vec B}_{ext{\rm{ }}}}}\) to pass through them. \(\mu_{r}\) is slightly less than unity (1). Reason is definition for \(\mu_{r}\). So correct option is (2).
PHXII05:MAGNETISM and MATTER
360473
A ferromagnetic material is heated above its curie temperature. The correct statement among the following is
1 Ferromagnetic domains become random.
2 Ferromagnetic domains are perfectly arranged.
3 Ferromagnetic material changes itself into diamagnetic material.
4 Ferromagnetic domains are not influenced
Explanation:
On heating, different domains have net magnetisation in them which are randomly distributed. Thus the net magnetisation of the substance due to various domains decreases to minimum.
