A long, straight wire carries a current \(i.\) The magnetizing field intensity \(H\) is measured at a point \(P\) close to the wire. A long, cylindrical iron rod is brought close to the wire so that the point \(P\) is at the center of the rod. The value of \(H\) at \(P\) will:

1.	increase many times	2.	decrease many times
3.	remain almost constant	4.	become zero

The magnetic susceptibility is negative for:

The permanent magnetic moment of the atoms of a material is not zero. The material:

The permanent magnetic moment of the atoms of a material is zero. The material:

Choose the correct option:
1. (a), (b)
2. (b) only
3. (c), (d)
4. (a), (d)

Which of the following pairs has quantities of the same dimensions?

Choose the correct option from the given ones: 
1. (a) and (b) only
2. (b) and (c) only
3. (c) and (d) only
4. (a) and (d) only

Mark out the correct options.

(a) Diamagnetism occurs in all materials.
(b) Diamagnetism results from the partial alignment of permanent magnetic moment.
(c) The magnetizing field intensity H is always zero in free space.
(d) The magnetic field of induced magnetic moment is opposite to the applied field.

Choose the correct option

1. (a), (b)

2. (b), (c)

3. (c), (d)

4. (a), (d)

A ferromagnetic material is placed in an external magnetic field. The magnetic domains:

A paramagnetic material is kept in a magnetic field. The field is increased till the magnetization becomes constant. If the temperature is now decreased, the magnetization:

A paramagnetic material is placed in a magnetic field. Consider the following statements:

To measure the magnetic moment of a bar magnet, one may use

(a) a tangent galvanometer

(b) a deflection galvanometer if the earth’s horizontal field is known

(c) an oscillation magnetometer if the earth’s horizontal field is known

(d) both deflection and oscillation magnetometer if the earth’s horizontal field is not known

Choose the correct option 

1.  (a) , (b) , (c)

2. (b) , (c) , (d)

3. (c) , (d) , (a)

4. (a) , (d) , (b)