Question

Nickel shows ferromagnetic property at room temperature. If the temperature is increased beyond Curie temperature then it will show

• A. diamagnetism
• B. paramagnetism
• C. anti ferromagnetism
• D. no magnetic property

Answer 1

The correct option is B paramagnetism

Nickel exhibits ferromagnetism due to a quantum physical effect called exchange coupling in which electron spins of one atom interact with those of neighboring atoms. If the temperature of a ferromagnetic material is raised above a certain value,called the curve temperature, the coupling ceases to be effective. Most such material then becomes simply para magnetic.