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
Hammering a magnet
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.
1. Which colour has the highest energy?
2. The electrical domestic tube light gives white fluorescent light because of
5. The SI unit of acceleration is _______________.
7. The atmosphere is heated mainly by
8. SHOCK ABSORBERS are usually made of steel because :