The magnetization of a piece of iron or steel:

When a magnetic material is subjected to a very small magnetising force \(H,\) the intensity of magnetisation is proportional to:

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 magnetic moment of a magnet \((10 ~cm\times 4~cm\times1~cm)\) is \(4 ~Am^2\). Its intensity of magnetisation is:

1. 10³ A/m

2. 10² A/m

3. 10⁵ A/m

4. 10⁴ A/m

S.I. unit of intensity of magnetization is:

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

Which of the following is not dimensionless?
(where symbols stand for their usual meanings in magnetism)

1. $\frac{I}{H}$

2. $\frac{B}{{\mu }_{0}H}$

3. ${\mu }_r$

4. $\frac{{\mu }_{r}B}{H}$

A bar magnet has coercivity $4\times {10}^3$ $A{m}^{-1}$. It is desired to demagnetize it by inserting it inside a solenoid 12 cm long and having 60 turns. The current that should be sent through the solenoid is:

1. 2 A

2. 4 A

3. 6 A

4. 8 A