Question

Atoms or molecules of liquid or gaseous mate-rial are in rapid motion and are not aligned. Thus,

• A. Fluids can be easily magnetised
• B. Fluids can never be magnetised
• 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 magnetised

Answer 1

The correct option is C Liquid iron rotating about an axis in earth's core is an exception

As the material gets heated or it is in its liquid or gaseous state, the atoms or molecules are in rapid motion and are not aligned. Thus, fluids are seldom magnetic. An exception is when a magnetic material such as iron is in its liquid state and is continuously rotating around the axis; the atoms can be aligned in one direction, even though they are in liquid rapid motion.