Statement I : The ferromagnetic property depends on temperature. At high temperature, ferromagnet becomes paramagnet.
Statement II : At high temperature, the domain wall area of a ferromagnetic substance increases.
In the light of the above statements, choose the most appropriate answer from the options given below :
Statement II : At high temperature, the domain wall area of a ferromagnetic substance increases.
In the light of the above statements, choose the most appropriate answer from the options given below :
- (A)Both Statement I and Statement II are false
- (B)Statement I is true but Statement II is false✓ Correct
- (C)Statement I is false but Statement II is true
- (D)Both Statement I and Statement II are true
Answer: (B)
Solution
Statement I is TRUE: Ferromagnetic materials lose their ferromagnetic property at high temperatures (above Curie temperature) and become paramagnetic. The thermal energy disrupts the alignment of magnetic domains.
Statement II is FALSE: At high temperatures, the magnetic domains actually break down and become randomized, rather than the domain wall area increasing. The ordered domain structure is destroyed by thermal agitation.
Therefore, Statement I is true but Statement II is false.
Statement II is FALSE: At high temperatures, the magnetic domains actually break down and become randomized, rather than the domain wall area increasing. The ordered domain structure is destroyed by thermal agitation.
Therefore, Statement I is true but Statement II is false.
JEE Main · 2021 · 22 Jul 2021 · Shift 2 · Single correct option