Which of the following statements is INCORRECT for diamagnetic materials? a. Relative permeability is less than one. b. Magnetic susceptibility is negative and low. c. Magnetic susceptibility does not depend on the temperature. d. Magnetic susceptibility is positive and low.

Step-by-step solution

For diamagnetic materials, the magnetic susceptibility ( ) is small and negative. This implies statement b is correct and statement d is incorrect. The relative permeability ( _r ) is related to susceptibility by _r = 1 + . Since is small and negative, _r is slightly less than 1 . This implies statement a is correct. Diamagnetism arises due to the inherent orbital motion of electrons in atoms and is practically unaffected by the thermal agitation. Therefore, the magnetic susceptibility of diamagnetic materials is i