Question:
The figure shows variation of heat capacity with temperature for Nickel (0–800 K). If the curve shows discontinuity at point P, then this is due to:
The figure shows variation of heat capacity with temperature for Nickel (0–800 K). If the curve shows discontinuity at point P, then this is due to:
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Discontinuity in heat capacity often indicates phase or magnetic transition (Curie point in ferromagnets).
Updated On: Jun 29, 2026
- Magnetic transformation of Nickel bar
- Change due to inclusions in Nickel bar
- Change due to porosity in Nickel bar
- Change in dimensions of Nickel bar
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The Correct Option is A
Solution and Explanation
Concept:
Nickel is a ferromagnetic material at low temperature. As temperature increases, it undergoes a transition from ferromagnetic to paramagnetic state at the Curie temperature.
At this point, magnetic ordering disappears, causing a sudden change (discontinuity) in heat capacity curve.
Step 1: Identify physical nature of Nickel.
Nickel is ferromagnetic below Curie temperature: \[ T < T_C \Rightarrow \text{ordered magnetic domains} \]
Step 2: Understand discontinuity point P.
At point P: \[ \text{Ferromagnetic} \rightarrow \text{Paramagnetic transition} \] This is known as Curie transition.
Step 3: Effect on heat capacity.
Magnetic ordering contributes to internal energy. When it changes abruptly: \[ C_p \text{ shows discontinuity} \] Final Answer: \[ \text{Magnetic transformation of Nickel bar} \]
Step 1: Identify physical nature of Nickel.
Nickel is ferromagnetic below Curie temperature: \[ T < T_C \Rightarrow \text{ordered magnetic domains} \]
Step 2: Understand discontinuity point P.
At point P: \[ \text{Ferromagnetic} \rightarrow \text{Paramagnetic transition} \] This is known as Curie transition.
Step 3: Effect on heat capacity.
Magnetic ordering contributes to internal energy. When it changes abruptly: \[ C_p \text{ shows discontinuity} \] Final Answer: \[ \text{Magnetic transformation of Nickel bar} \]
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