Which of the following, the most suitable material for making permanent magnet is
Correct answer: D. Nickel
- A. Aluminium
- B. Bismuth
- C. Copper
- D. Nickel
Explanation
The correct answer is Nickel. Nickel is a ferromagnetic material, which means it can be magnetised and retain its magnetisation over time, making it an excellent choice for creating permanent magnets. In contrast, Aluminium, Bismuth, and Copper are not suitable for making permanent magnets. Aluminium and Copper are non-magnetic materials, while Bismuth exhibits diamagnetism, which means it actually repels magnetic fields and cannot retain magnetisation.
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About Physics of Solids
Solids are compared through crystal structure, amorphous arrangement, elasticity, plastic deformation, stress, strain and Young’s modulus. Electrical behavior depends on available charge carriers and band structure, so conductors, insulators and semiconductors must be distinguished from mechanical properties such as strength, stiffness and brittleness.
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