Question

Pick out the temperature at which iron becomes paramagnetic?

(a) 800 °C

(b) 700 °C

(c) 600 °C

(d) 500 °C

I got this question in an internship interview.

Asked question is from Permanent Magnets and Electromagnets topic in chapter Magnetism and Matter of Physics – Class 12

Answer 1

Right choice is (a) 800 °C

To elaborate: Iron is a ferromagnetic material. Ferromagnetism decreases with a rise in temperature, and above a certain temperature called “Curie’s temperature,” ferromagnets become paramagnets. For iron, it is approximately, 800 °C.