When magnetic
field is applied, those electrons having orbital magnetic moment in the
same direction slow down and those in the opposite direction speed up This happens due to induced current in accordance with Lenz’s law which
you will study in Chapter 6 Thus, the substance develops a net magnetic
moment in direction opposite to that of the applied field and hence repulsion Some diamagnetic materials are bismuth, copper, lead, silicon,
nitrogen (at STP), water and sodium chloride