Question

Any magnetic material loses its magnetic property when it is:

• A. Dipped in water
• B. Dipped in sand
• C. Attached to an iron piece
• D. Heated to high temperature

Hint:

A magnetic material loses its magnetization when heated above its Curie Temperature. This causes thermal agitation, which disrupts the alignment of atomic dipoles, making the material paramagnetic.

Answer 1

The Correct Option is D

A magnetic material loses its magnetic property when it is heated to high temperature. This phenomenon is known as the Curie point or Curie temperature. The Curie point is the temperature at which certain materials lose their permanent magnetic properties, to be replaced by induced magnetism. Upon heating to this temperature, the thermal energy overcomes the magnetic energy, causing the material to transition from a ferromagnetic state to a paramagnetic state. In a paramagnetic state, the material does not retain magnetic alignment in the absence of an external magnetic field, thus losing its magnetization.

Answer 2

Step 1: Understanding Magnetic Property Loss Magnetic materials exhibit magnetism due to the alignment of their atomic dipoles. However, when subjected to high temperatures, these dipoles gain excessive thermal energy and start to misalign, leading to a loss of magnetization. 
Step 2: Curie Temperature Concept The temperature beyond which a magnetic material loses its permanent magnetism is called the Curie Temperature. Above this temperature, the material transitions from a ferromagnetic to a paramagnetic state, losing its strong magnetic properties.
Step 3: Evaluating the Given Options - Dipping in water (Incorrect): Water does not affect the internal magnetic alignment of a material. 
- Dipping in sand (Incorrect): Sand particles do not alter the magnetic domains of a material. 
- Attaching to an iron piece (Incorrect): This only affects external interactions but does not remove the intrinsic magnetism. 
- Heating to high temperature (Correct): Heat energy disrupts the alignment of magnetic dipoles, causing the material to lose its magnetization.
Step 4: Conclusion Thus, a magnetic material loses its magnetic property when it is heated to a high temperature.