A regular array of identical vertical current-carrying wires, each passing through a horizontal table, is arranged as shown in the figure (with the direction of current flow indicated). Where are diamagnetic particles most likely to accumulate if they are scattered on the table?
                           

1.	Around regions such as \(A.\)
2.	Around regions such as \(B.\)
3.	In circular regions around individual wires such as \(C.\)
4.	Uniformly everywhere.

A uniform magnetic field, parallel to the plane of the paper existed in space initially directed from left to right. When a bar of soft iron is placed in the field parallel to it, the lines of force passing through it will be represented by:

1.		2.
3.		4.

The variation of magnetic susceptibility $\left(\chi \right)$ 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:

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:

Which one of the following is true?

Four small identical bar magnets, each of magnetic dipole moment \(M\), are placed on the vertices of a square of side \(a\) such that the diagonals of the square coincide with the perpendicular bisectors of the respective magnets. The net magnetic field at the centre of the square is:

           
1. zero

2. \(\dfrac{\mu_{0}}{\sqrt{2 \pi}} \dfrac{M}{a^{3}}\)

3. \(\dfrac{2 \sqrt{2} \mu_{0}}{\pi} \cdot \dfrac{M}{a^{3}}\)

4. \(\dfrac{\mu_{0}}{\pi} \cdot \dfrac{M}{a^{3}}\)

The material which is used to make permanent magnet has:

The magnetic moment of a magnet \((10 ~\text{cm}\times 4~\text{cm}\times1~\text{cm})\) is \(4 ~\text{Am}^2\). Its intensity of magnetisation is:
1. \(10^{3}~\text{A/m}\)
2. \(10^{2}~\text{A/m}\)
3. \(10^{5}~\text{A/m}\)
4. \(10^{4}~\text{A/m}\)

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: