Consider the following statements regarding ferromagnetic materials : 1. Soft magnetic materials have low permeability. 2. Soft magnetic materials have low coercive force. 3. Hard magnetic materials are used for their ability to retain magnetic fields. Which of the above statements are correct?
Ferromagnetic Properties Analysis
We need to evaluate the given statements about soft and hard magnetic materials.
Statement 1: Soft magnetic materials have low permeability.
Soft magnetic materials are easily magnetized and demagnetized. This ease of magnetization is characterized by a high magnetic permeability ($\mu$). Therefore, this statement is incorrect.
Statement 2: Soft magnetic materials have low coercive force.
The coercive force ($H_c$) is the measure of the magnetic field required to demagnetize a material. Soft magnetic materials are designed to lose their magnetism easily when the external field is removed. This requires a low coercive force ($H_c$). Therefore, this statement is correct.
Statement 3: Hard magnetic materials are used for their ability to retain magnetic fields.
Hard magnetic materials are difficult to magnetize but retain their magnetism strongly once magnetized. This property, known as high retentivity and high coercive force, makes them suitable for creating permanent magnets. Therefore, this statement is correct.
Conclusion on Statements
Based on the analysis:
- Statement 1 is incorrect.
- Statement 2 is correct.
- Statement 3 is correct.
Thus, the correct statements are 2 and 3.
Important Questions from Magnetic Materials
The substances which are attracted by the magnetic field are
The dimension of ferromagnetic domains is in the order of
Of the following, the most suitable for making permanent magnet is:
The magnetic fields at a distance 'd' from a short bar magnet in longitudinal and transverse positions are in the ratio:
Magnets lose their magnetic properties, when
