Locus of all points having the same dip on the magnetic map of the earth is known as :

1. Isodynamic line

2. Isogonic line

3. Isothermal line

4. Isoclinic line

Subtopic:  Earth's Magnetism (OLD NCERT) |
 56%
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Magnetic induction at an axial point of a short magnet at a distance \(r\) from the centre of dipole is \(\vec B\). Its value at the equatorial point of the short magnet at the same distance from the centre of dipole is:
1. \(-\vec B\)
2. \(\frac{\vec B}{2}\)
3. \(\vec B\)
4. \(\frac{-\vec B}{2}\)

Subtopic:  Analogy between Electrostatics & Magnetostatics |
 67%
From NCERT
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Consider a magnetic dipole kept in the east-west direction. Let P1, P2, Q1, Q2 be four points at the same distance from the dipole towards north, south, east and west of the dipole respectively. The directions of the magnetic field due to the dipole are the same only at:
1. Pand Q1
2. Pand Q1
3. Pand Q2
4. Qand Q2

Subtopic:  Bar Magnet |
 69%
From NCERT
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Due to a small magnet, the intensity at a distance \(x\) in the end-on position is \(9~\text{gauss}\). What will be the intensity at a distance \(\frac{x}{2}\) on equatorial position?
1. \(9~\text{gauss}\)
2. \(4~\text{gauss}\)
3. \(36~\text{gauss}\)
4. \(4.5~\text{gauss}\)

Subtopic:  Bar Magnet |
 74%
From NCERT
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At the magnetic equator, the angle of dip is

1. 0°

2. 90°

3. 45°

4. 135°

Subtopic:  Earth's Magnetism (OLD NCERT) |
 78%
From NCERT
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The bar magnet \(A\) of magnetic moment \(M_A\) is found to oscillate at a frequency twice that of magnet \(B\) of magnetic moment \(M_B\) and the same moment of inertia when placed in a vibration magnetometer. We may say that:
1. \(M_B=8M_A\)
2. \(M_A= 4M_B\)
3. \(M_A=8M_B\)
4. \(M_A=2M_B\)

Subtopic:  Analogy between Electrostatics & Magnetostatics |
 85%
From NCERT
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Magnetic screening is:

1. Not possible

2. Possible using superconductors

3. Possible using the iron ring as cover

4. Both (2) & (3)

Subtopic:  Magnetic Materials |
 72%
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The apparent dip at a place is always greater than or equal to the value of true dip at that place. This is due to

1.  An increase in the apparent value of BV

2. A decrease in the apparent value of BH

3. An increase in the apparent value of BH

4. Both (1) & (2)

Subtopic:  Earth's Magnetism (OLD NCERT) |
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If a bar magnet is kept on a horizontal plane with N-pole of bar magnet facing geographic N-pole and S-pole of bar magnet facing geographic S-pole, then the number of neutral points is:

1. 0 2.
3. 2 4. Infinite
Subtopic:  Earth's Magnetism (OLD NCERT) |
 52%
From NCERT
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The magnetization of a piece of iron or steel:

1. depends on the strength of the magnetizing field.
2. depends on external conditions such as temperature.
3. cannot be done beyond the saturation point.
4. all of these.

Subtopic:  Magnetization & Magnetic Intensity |
 88%
From NCERT
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