Question

Atoms or molecules of liquid or gaseous material are in rapid motion and are not aligned. Thus,
A. Fluids can be easily magnetized
B. Fluids can never be magnetized
C. Liquid iron rotating about an axis in earth’s core is an exception
D. Liquid iron rotating about an axis in earth’s core is difficult to be magnetized

Answer 1

The magnetic behavior of the material depends on the individual magnetic moments of the atoms. When they are aligned in the same direction then the magnetic property will be greater. A material is magnetized when we can align the magnetic domains in one direction.

Complete step-by-step solution:
Atoms or molecules of liquid or gaseous material are in rapid motion and are not aligned. When the temperature increases it will attain the state of fluids. The molecules are not aligned in the fluid. But the ferromagnetic materials are easier to magnetize. Hence they can attract the magnet. Usually a material is magnetized by bringing a magnet beside. And thus align the magnetic domains of the material in one direction.
But we have to consider an exceptional case also. At earth’s core the temperature is greater. But the liquid iron which is a magnetic material when rotating about an axis in earth’s core the atoms are aligned. This is because of the rotation about an axis. Even though they are in rapid motion in the liquid state, the magnetic domains get aligned. Thus they show magnetic property.
The answer is option C.

Note:- We have to note that the Ferro magnetic materials are strong magnets, where the magnetic domains are well arranged. And Iron is a Ferromagnetic material. So when rotating about an axis the atoms will be definitely aligned.