42. The method of magnetisation is: A.Hammering a magnet B.Heating a magnet C.Passing direct current through it D.Passing alternating current through it
Option A Solution: Hammering a rod will either allow it to become slightly magnetic if laid along a magnetic field (i.e.North - South) or demagnetise it if laid across the field lines (i.e. East-West). A current passing through a coil will produce a magnetic field.
