Question

Which of the following statements is true about diamagnetic materials?

Diamagnetism is a property that appears in all materials, but that in paramagnetic and ferromagnetic substances, the diamagnetic effect is overcome by other forms of magnetism.

Diamagnetic materials, such as the gadolinium transition metal, are particularly useful as contrast agents in diagnostic procedures such as MRI.

A compound with twelve diamagnetic electrons and one paramagnetic electron is strongly diamagnetic and only weakly paramagnetic.

Diamagnetic materials form internal and induced magnetic fields, in the same direction as the direction of external magnetic fields, while paramagnetic materials form opposite fields to external fields.

Answer 1

1) for option one diamagnefism and paramagnetism are properties of a materia that induced an internal magnetism in it which oposes the magnetic field or are in same direction to the magnetic field respectively and are weak in nature. So in a paramagnetic subtances the effect of diamagnetism need not be overcome by paramagnetic effect. So the first option is not correct.

2) gadolinium transition metal are indeed useful in increse the quality of MRI but those metals are strongly paramagnetic. So this option is false.

3) third option may be correct since diamagnetic material consist of paired electrons and paramagnetic materail consist of unpaired electrons. So since there are 10 paired electrom so this is strongly diamagnetic and weakly paramagnetic.

4)from definition we know that in diamagnetic material the induced magnetic field is in the opposite direction to the external field. So this option is incorrect.

Here only option c) is correct.