The material which is used to make permanent magnet has:

1. High retentivity, low coercivity
2. Low retentivity, low coercivity
3. Low retentivity, high coercivity
4. High retentivity, high coercivity

Subtopic:  Magnetic Materials |
 74%
From NCERT
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On a magnetic map, the lines joining the points of the same value of the horizontal component of the earth's magnetic field are called :

1. Aclinic lines

2. Isoclinic lines

3. Isodynamic lines

4. Isogonic lines

Subtopic:  Earth's Magnetism (OLD NCERT) |
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What is the unit of pole strength of a bar magnet?

1. ampere-metre

2. ampere/metre

3. ampere/metre2

4. ampere-metre2

Subtopic:  Bar Magnet |
 73%
From NCERT
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The ratio of magnetic length and geometrical length of a bar magnet is about :

1. 0.84

2. 0.42

3. 0.21

4. 1

Subtopic:  Bar Magnet |
 70%
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An electric cable is carrying current from north to south. The position of the null point from the cable is:

1. Vertically upward

2. Vertically downward

3. Eastward

4. Nowhere

Subtopic:  Earth's Magnetism (OLD NCERT) |
From NCERT
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A substance is placed in an external magnetic field. If the direction of induced dipole moment is opposite to the direction of the applied magnetic field, then the substance may be

1. Paramagnetic

2. Diamagnetic

3. Ferromagnetic

4. Both (1) & (3)

Subtopic:  Magnetic Materials |
 79%
From NCERT
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If Bo is magnetic flux density in vacuum produced by a magnetising force and magnetic flux density produced by the magnetisation of a material due to the same magnetising force is Bm, then the total magnetic flux density in the material is :

1. B+ Bm
2. B- Bm
3. BBm
4. BmB

Subtopic:  Magnetization & Magnetic Intensity |
 67%
From NCERT
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A magnet (primary) oscillates with frequency ν1 in earth's magnetic field (BH) alone. Now a secondary magnet is placed near the primary magnet. If B is the magnetic field of the second magnet on the primary magnet in the direction of BH, the primary magnet oscillates with frequency ν2, then the ratio of B/BH is :

1. ν2ν12

2. v2v12-1

3. ν2ν12 + 1

4. ν1ν22-1

 

Subtopic:  Bar Magnet |
 64%
From NCERT
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The angle of dip is θ1 on a given meridian which is at an angle θ with the magnetic meridian. If θ2 is the angle of dip on another meridian which is perpendicular to the first meridian, then θ, θ1 and θ2 are related as :

1. cot2θ = cot2θ1+cot2θ2

2. tan2θ = tan2θ1+tan2θ2

3. tanθtanθ1tanθ2

4. tanθ = tanθ1 + tanθ2

Subtopic:  Earth's Magnetism (OLD NCERT) |
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The magnetic susceptibility χ of a ferromagnetic material varies with temperature, as:

1.  2.
3. 4.

Subtopic:  Curie's Law and Hysteresis (OLD NCERT) |
 65%
From NCERT
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