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QPages 285-286: Q2: HC Verma: Concepts of Physics - Volume 2 Magnetic Properties of Matter Pages 285-286: Q2 Solution: A paramagnetic material is kept in a magnetic field. The field…

⚠️ Common Exam Traps & Conceptual Pitfalls

Students often think that once magnetisation has reached a constant value at a given field it will stay unchanged when temperature changes. In paramagnetic materials, however, magnetisation follows Curie’s law $M=C,B/T$, so with $B$ fixed a lower temperature reduces thermal agitation and increases $M$ even if the field is unchanged.

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

Multiple Choice Options

  • A will increase
  • B will decrease
  • C will remain constant
  • D may increase or decrease

Step-by-Step Verified Solution

**Answer:** (a) will increase. **Step-by-Step Explanation:** If temperature decreases, thermal agitation decreases, so magnetisation increases (approaches saturation).

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