A dip needle in a plane perpendicular to magnetic meridian will remain:
1. Vertical
2. Horizontal
3. In any direction
4. At an angle of dip to the horizontal
The earth's magnetic field at a certain place has a horizontal component 0.3 Gauss and the total strength 0.5 Gauss. The angle of dip is:
1.
2.
3.
4.
A superconductor exhibits perfect:
1. Ferrimagnetism
2. Ferromagnetism
3. Paramagnetism
4. Diamagnetism
Two short magnets of equal dipole moments \(M\) are fastened perpendicularly at their centres (figure). The magnitude of the magnetic field at a distance \(d\) from the centre on the bisector of the right angle is:
1. | \(\frac{\mu_{0}}{4 \pi}\frac{M}{d^{3}}\) | 2. | \(\frac{\mu_{0}}{4 \pi}\frac{M \sqrt{2}}{d^{3}}\) |
3. | \(\frac{\mu_{0}}{4 \pi}\frac{2 \sqrt{2} M}{d^{3}}\) | 4. | \(\frac{\mu_{0}}{4 \pi}\frac{2 M}{d^{3}}\) |
The variation of magnetic susceptibility with temperature for a diamagnetic substance is best represented by:
1. | 2. | ||
3. | 4. |
The variation of the intensity of magnetisation \((I)\) with respect to the magnetising field \((H)\) in a diamagnetic substance is described by the graph:
1. | \(OD\) | 2. | \(OC\) |
3. | \(OB\) | 4. | \(OA\) |
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 |
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 |
The magnetic dipoles in a diamagnetic material are represented, for three situations. The three situations differ in magnitude if a magnetic field is applied to the material. In which situation the magnetization of the material is the greatest:
1. | \(A\) | 2. | \(B\) |
3. | \(C\) | 4. | Equal in \(A,B\) and \(C\) |
If H is the horizontal component of the earth's magnetic field and 'V' is the vertical component of the earth's magnetic field, then at the magnetic equator:
1. V and H are equal.
2. values of V and H are zero.
3. value of H is zero only.
4. value of V is zero only.