The magnetic dipoles in a diamagnetic material are represented, for three situations. The three situations differ in the magnitude if a magnetic field applied to the material. In which situation the magnetisation of the material is the greatest :

1. A

2. B

3. C

4. equal in A,B and  C

An iron rod of length L and magnetic moment M is bent in the form of a semicircle. Now its magnetic moment will be 

1. M

2. $\frac{2\mathrm{M}}{\mathrm{\pi }}$

3. $\frac{\mathrm{M}}{\mathrm{\pi }}$

4. $\mathrm{M\pi }$

Time period of a freely suspended magnet does not depend upon 

1. length of the magnet

2. pole strength of the magnet

3. horizontal component of earth's magentic field

4. length of the suspension thread

Relative permeability of iron is 5500, then its magnetic suceptibility will be -

1. 5501

2. 5499

3. $5500\times {10}^7$

4. none of these

A current carrying coil is placed with its axis perpendicular to N-S direction. Let horizontal component of earth's magnetic field be ${\mathrm{H}}_0$ and magnetic field inside the loop be H. If a magnet is suspended inside the loop, it makes angle $\mathrm{\theta }$ with H. Then $\mathrm{\theta \; equal\; to:}$

1. ${\tan }^{-1}\left(\frac{H_0}{H}\right)$

2. ${\tan }^{-1}\left(\frac{H}{H_{\mathit{0}}}\right)$

3. $\cos e{c}^{-1}\left(\frac{H}{H_{\mathit{0}}}\right)$

4. $co{t}^{-1}\left(\frac{H_0}{H}\right)$

The magnetic susceptibility of a paramagnetic substance at -73$°$C is 0.0060, then its value at -173$°$C will be 

1. 0.0030

2. 0.0120

3. 0.0180

4. 0.0045

Domain formation is the necessary feature of : 

(1) ferromagnetism                   (2) diamagnetism

(3) paramagnetism                   (4) all of these

Which of the following property of magnetic materials is observed in all the materials?

1. Ferromagnetism

2. Paramagnetism

3. Diamagnetism

4. Electromagnetism

Two small bar magnets are placed in a plane. The direction of their dipole moments and the position of magnets are as shown in the figure.

The appropriate direction of the net magnetic field at point 'P' will be indicated by which of the following arrow?

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.