Question

Given below are two statements:  
Statement I : The diamagnetic property depends on temperature.  
Statement II : The included magnetic dipole moment in a diamagnetic sample is always opposite to the magnetizing field.  
In the light of given statement, choose the correct answer from the options given below:  

• A. Both Statement I and Statement II are true.
• B. Both Statement I and Statement II are false.
• C. Statement I is correct but Statement II is false.
• D. Statement I is incorrect but Statement II is true

Answer 1

The Correct Option is D

To determine the correct answer, let's analyze the statements provided:

1. Statement I: The diamagnetic property depends on temperature.
   • Diamagnetism is a property of all materials and is characterized by a weak repulsion from a magnetic field. This behavior is due to changes in the orbital motion of electrons when an external magnetic field is applied.
   • Importantly, the diamagnetic effect is not dependent on temperature. This is because there are no free-moving charges (such as conduction electrons) whose arrangement can be affected by temperature changes in diamagnetic materials.

   Therefore, Statement I is incorrect.

2. Statement II: The induced magnetic dipole moment in a diamagnetic sample is always opposite to the magnetizing field.
   • Diamagnetism arises because the electrons in atoms or molecules experience a force from the external magnetic field that induces an opposite magnetic moment. This causes them to resist the external magnetic field.
   • As a result, the induced magnetic dipole moment is always opposite to the direction of the applied magnetic field.

   Therefore, Statement II is true.

Based on the analysis, the correct option is: Statement I is incorrect but Statement II is true.