Which of the following is diamagnetism?

Answer: Diamagnetism is a special type of magnetic nature of elements which is already present in the elements without any external effect. This special characteristic shows that some elements repel magnets or are repelled by a magnetic field. The external magnetic field generates an induced magnetic field within them and this phenomenon takes place.

 In 1778, when people saw that bismuth and antimony are repelling a magnet, the concept of diamagnetism arose. Now, scientists have found that, most of the elements in nature are of diamagnetic character.

 Examples of diamagnetic elements: Iron (Fe), Water (H₂O),  Marble (CaCO₃ ), glass, Sodium Chloride (NaCl), Copper (Cu), Zinc (Zn), Silver (Ag), Gold (Au) etc.