Question

The variation of magnetic susceptibility \((\chi)\) with temperature for a diamagnetic substance is shown correctly by graph

• A. D
• B. B
• C. A
• D. C

Hint:

Diamagnetic susceptibility is small, negative and independent of temperature.

Answer 1

The Correct Option is C

Step 1: Understanding the Concept
For a diamagnetic substance \(\chi\) is negative and does not change with temperature.

Step 2: Look at the graphs
Graph B is a constant positive value. Graphs C and D fall with temperature (like paramagnetic or ferromagnetic behaviour). Graph A is a horizontal line below the T axis, i.e. a constant negative value.

Step 3: Result
Graph A is correct, which is option (C).

Final Answer:
The graph is a horizontal line below the axis, so susceptibility is negative and constant. \[ \boxed{\text{(C) }\text{graph A}} \]