A thin diamagnetic rod is placed vertically between the poles of an electromagnet. When the current in the electromagnet is switched on, then the diamagnetic rod is pushed up, out of the horizontal magnetic field. Hence the rod gains gravitational potential energy. The work required to do this comes from:

1. the current source
2. the magnetic field
3. the lattice structure of the material of the rod
4. the induced electric field due to the changing magnetic field.
Subtopic:  Magnetic Materials |
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The magnetic susceptibility is negative for:
1. Paramagnetic material only
2. Ferromagnetic material only
3. Paramagnetic and ferromagnetic materials
4. Diamagnetic material only
Subtopic:  Magnetic Materials |
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There are four light-weight-rod samples A, B, C, D separately suspended by threads. A bar magnet is slowly brought near each sample and the following observations are noted: 
(i) A is feebly repelled.
(ii) B is feebly attracted.
(iii) C is strongly attracted.
(iv) D remains unaffected.
Which one of the following is true?


1.  C is of a diamagnetic material.
2.  D is of a ferromagnetic material.
3.  A is of a non-magnetic material.
4.  B is of a paramagnetic material.

Subtopic:  Magnetic Materials |
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The magnetic moment of a diamagnetic atom is

1. 1

2. between zero and one

3. equal to zero

4. much greater than one

Subtopic:  Magnetic Materials |
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If a diamagnetic substance is brought near the north or the south pole of a bar magnet, it is:

1. Repelled by both the poles

2. Repelled by the north pole and
    attracted by the south pole

3. Attracted by the north pole and
    repelled by the south pole

4. Attracted by both the poles

Subtopic:  Magnetic Materials |
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Nickel shows the ferromagnetic property at room temperature. If the temperature is increased beyond Curie temperature, then it will show:

1. paramagnetism

2. anti-ferromagnetism

3. no magnetic property

4. diamagnetism

Subtopic:  Magnetic Materials |
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If the magnetic dipole moment of an atom of diamagnetic material, paramagnetic material and ferromagnetic material are denoted by µd, µp, and µf respectively, then:

1. µp = 0 and µf ≠ 0

2. µd ≠ 0 and µp = 0

3. µd ≠ 0 and µf ≠ 0

4. µd = 0 and µp ≠ 0

Subtopic:  Magnetic Materials |
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Diamagnetic material in a magnetic field moves:

1. from stronger to the weaker parts of the field

2. from weaker to the stronger parts of the field

3. perpendicular to the field

4. in none of the above directions

Subtopic:  Magnetic Materials |
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Among which of the following the magnetic susceptibility does not depend on the temperature:
1. diamagnetism 
2. paramagnetism 
3. ferromagnetism 
4. ferrite

Subtopic:  Magnetic Materials |
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For protecting a magnetic needle, it should be placed:

1.  in an iron box.

2.  in a wooden box.

3.  in a metallic box.

4.  none of these.

Subtopic:  Magnetic Materials |
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