Define magnetic susceptibility of a material.Name two elements one having positive susceptibility and the other having negative susceptibility. What does negative susceptibility signify?

Explanation

The ratio of intensity of magnetization (I) to the magnetising force (H) is magnetic susceptibility x of a material `x = I//H`
Iron and nickel have positive susecptibility
Copper and silver have negative susceptibility .
Negative value of susceptibility implies that the material is diamagnetic and weakly magnetised in a direction opposite to the applied field.