A diamagnetic substance is kept in a uniform external magnetic field B. If the net magnetic field inside the substance is B', then

1. B'<B

2. B' = B

3. B'>B

4. Any of the above

Subtopic:  Magnetization & Magnetic Intensity |
 74%
From NCERT
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The lines joining the places of zero declination are called :

1. Isogonic lines

2. Agonic lines

3. Isoclinic lines

4. Aclinic lines

Subtopic:  Earth's Magnetism (OLD NCERT) |
 52%
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A magnetic needle makes n oscillations per minute in a horizontal plane where the angle of dip is 45°. If the needle is made to oscillate in a vertical plane coinciding with the magnetic meridian, then the number of oscillations per minute will become/remains

1. n

2. 2n

3. (2)1/4 n

4. n/2

Subtopic:  Earth's Magnetism (OLD NCERT) |
 50%
From NCERT
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Two similar nature magnetic poles of strength 16 A-m and 64 A-m are placed at a distance of 120 cm in air. At which point on the line joining the two poles, the force on another unit north pole will be zero?

1. 0.8 m from 64 A-m

2. 0.8 m from 16 A-m

3. 0.4 m from 64 A-m

4. 0.6 from 64 A-m

Subtopic:  Analogy between Electrostatics & Magnetostatics |
 59%
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The magnetic moment of a short dipole is \(100\) A-m2. The magnetic induction in vacuum at \(1\) m from the dipole on the axis of the dipole is:
1. \(2\times10^{-5}~\text{T}\)
2. \(10^{-5}~\text{T}\)
3. \(2~\mu\text{T}\)
4. \(1~\mu\text{T}\)

Subtopic:  Analogy between Electrostatics & Magnetostatics |
 76%
From NCERT
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A deflection magnetometer is placed in tanA position. The bar magnet is placed in :

1. East-West direction

2. North-south direction

3. North-east direction

4. South-West direction

Subtopic:  Bar Magnet |
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Each of the two identical magnets, when suspended alone, makes 30 oscillations per minute at a place. The number of oscillations per minute, if they are fixed at right angles ( to form a cross) and allowed to oscillate in the same field will be approximate:

1. 25 oscillation/minute

2. 30 oscillation/minute

3. 60 oscillation/minute

4. 15 oscillation/minute

Subtopic:  Bar Magnet |
From NCERT
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If the apparent value of dip at a place in two perpendicular vertical planes are respectively 30° and 45°, then the true angle of dip at that place is

1. cot-1(2)

2. tan-1(2)

3. cot-1(3)

4. cot-1(5)

Subtopic:  Earth's Magnetism (OLD NCERT) |
 60%
From NCERT
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The magnetic moment of a magnet \((10 ~cm\times 4~cm\times1~cm)\) is \(4 ~Am^2\). Its intensity of magnetisation is:

1. 10A/m

2. 10A/m

3. 10A/m

4. 10A/m

Subtopic:  Magnetization & Magnetic Intensity |
 78%
From NCERT
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If the magnetic field of the earth at any point on the magnetic equator is 0.4×10-4 T, then the value of the magnetic field at the magnetic pole of the earth is approximately

1. 0.4×10-4 T

2. 0.2×10-4 T

3. 0.8×10-4 T

4. 0.3×10-4 T

Subtopic:  Earth's Magnetism (OLD NCERT) |
From NCERT
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