Which of the following is the correct representation of magnetic field lines?

 

1. (g), (c)

2. (d), (f)

3. (a), (b)

4. (c), (e)

Subtopic:  Magnetic Field & Field Lines |
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When cooled below 4.2 K, mercury becomes a superconductor, which means it has no electrical resistance. When a current is passed through mercury under these conditions, which one of the following effects will be present?
(a) thermal
(b) chemical
(c) magnetic

1. (a) and (c) only
2. (a), (b) and (c) 
3. (b) only
4. (c) only

Subtopic:  Magnetic Materials |
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The \((B-H)\) curve for a certain specimen is schematically shown in the following diagram. Which one of the following is the correct magnetic nature of the specimen?

     
 
1. diamagnetic and not ferromagnetic or paramagnetic.
2. ferromagnetic and not diamagnetic or paramagnetic.
3. paramagnetic and not diamagnetic or ferromagnetic.
4. applicable to all the three types of magnetisms mentioned above.
Subtopic:  Curie's Law and Hysteresis |
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There are two materials A and B. The material B have high coercivity and A have low coercivity. The hysteresis loop area of material A is lesser than the material B. Then: 
1.  Material  A is preferred for making electromagnets 
2.  Material B is preferred for making permanent magnets 
3.  Material A is preferred for using electric generators and transformers
4.  All of these 
Subtopic:  Magnetization & Magnetic Intensity |
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Assertion (A): At the magnetic poles of the earth, horizontal component of earth's magnetic field will be zero.
Reason (R): At the magnetic equator of the earth, vertical component of earth's magnetic field will be zero.
1. Both (A) and (R) are true and (R) is the correct explanation of (A).
2. Both (A) and (R) are true but (R) is not the correct explanation of (A).
3. (A) is true but (R) is false.
4. (A) is false and (R) is also false.
Subtopic:  Earth's Magnetism |
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Assertion (A): Gauss's law for magnetism states that the net magnetic flux through any closed surface is zero.
Reason (R): The magnetic monopoles do not exist. North and South poles occur in pairs, allowing vanishing net magnetic flux through the surface.
1. (A) is true but (R) is false.
2. (A) is false but (R) is true.
3. both (A) and (R) are true and (R) is the correct
    explanation of (A).
4. both (A) and (R) are true but (R) is not the correct
    explanation of (A).

Subtopic:  Analogy between Electrostatics & Magnetostatics |
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Select correct option based on the statements:
 
Statement-I:  The magnetic field of a circular loop at very far away point on the axial line varies with distance as like that of a magnetic dipole.
Statement-II: The magnetic field due to magnetic dipole varies inversely with the square of the distance from the centre on the axial line.

1. I is correct and II is incorrect.
2. I is incorrect and II is correct.
3. Both I and II are correct.
4. Both I and II are incorrect.
Subtopic:  Analogy between Electrostatics & Magnetostatics |
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Assertion: If a compass needle is kept at the magnetic north pole of the earth, the compass needle may stay in any direction.

Reason: The dip needle will stay vertical at the north pole of the earth.
1. Both assertion and reason are true and the reason is the correct explanation of the assertion.
2. Both assertion and reason are true but the reason is not the correct explanation of the assertion.
3. Assertion is a true statement but the reason is false.
4. Both assertion and reason are false statements.

  1. If both the assertion and the reason are true and the reason is a correct explanation of the assertion
  2. If both the assertion and reason are true but the reason is not a correct explanation of the assertion
  3. If the assertion is true but the reason is false
  4. If both the assertion and reason are false
Subtopic:  Earth's Magnetism |
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Assertion: The earth's magnetic field is due to iron present in its core.

Reason: At a high-temperature magnet losses its magnetic property or magnetism. 1. Both assertion and reason are true and the reason is the correct explanation of the assertion.
2. Both assertion and reason are true but the reason is not the correct explanation of the assertion.
3. Assertion is a true statement but the reason is false.
4. Both assertion and reason are false statements.

  1. If both the assertion and the reason are true and the reason is a correct explanation of the assertion
  2. If both the assertion and reason are true but the reason is not a correct explanation of the assertion
  3. If the assertion is true but the reason is false
  4. If both the assertion and reason are false
Subtopic:  Earth's Magnetism |
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Assertion: At most of the points in northern hemisphere, the magnetic field is inclined to an angle below horizontal, whereas in the southern hemisphere, the magnetic field is inclined to an angle above horizontal.

Reason: The magnetic south pole is near the geographic north pole and vice versa.
1. Both assertion and reason are true and the reason is the correct explanation of the assertion.
2. Both assertion and reason are true but the reason is not the correct explanation of the assertion.
3. Assertion is a true statement but the reason is false.
4. Both assertion and reason are false statements.

  1. If both the assertion and the reason are true and the reason is a correct explanation of the assertion
  2. If both the assertion and reason are true but the reason is not a correct explanation of the assertion
  3. If the assertion is true but the reason is false
  4. If both the assertion and reason are false
Subtopic:  Earth's Magnetism |
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