Concepts Of Physics MCQ Edition [Volume 2]
- Exam
- Concepts Of Physics MCQ Edition [Volume 2]
- Subject
- Physics
- Chapter
- Magnetic Properties of Matter
Concepts Of Physics MCQ Edition [Volume 2] · Physics · Magnetic Properties of Matter
A paramagnetic material is placed within a magnetic field. The...
A paramagnetic material is placed within a magnetic field. The field is elevated until the magnetization attains a constant value. If the temperature is subsequently lowered, the magnetization will
Options
- Adecrease
- Beither increase or decrease
- Cincrease
- Dremain constant
Correct answer
D. remain constant
Step-by-step solution
When the magnetic field is elevated until the magnetization attains a constant value, the paramagnetic material achieves magnetic saturation.
At magnetic saturation, all the atomic magnetic dipoles are perfectly aligned in the direction of the external magnetic field, and the magnetization reaches its maximum possible value, , where is the number of atoms per unit volume and is the magnetic moment of each atom.
Lowering the temperature reduces thermal agitation, which normally opposes the alignment of dipoles. However, since all dipoles are already perfectly aligned at saturation, a decrease in temperature cannot increase the alignment any further.
Therefore, the magnetization will remain constant.
At magnetic saturation, all the atomic magnetic dipoles are perfectly aligned in the direction of the external magnetic field, and the magnetization reaches its maximum possible value, , where is the number of atoms per unit volume and is the magnetic moment of each atom.
Lowering the temperature reduces thermal agitation, which normally opposes the alignment of dipoles. However, since all dipoles are already perfectly aligned at saturation, a decrease in temperature cannot increase the alignment any further.
Therefore, the magnetization will remain constant.