1 Any metal detector can discriminate between gold and other metals.
2 Gold necklaces are found quite often.
3 The search coil is connected directly to a battery.
4 Metal detectors require a changing magnetic field.
5 The metal detector can only locate metals which contain iron or are magnetic.
6 Metal detectors are only used by treasure hunters.
7 Passing a current through the search coil and then switching it off, creates a pulse of magnetism round the coil.
8 All metal detectors are fitted with a flashing light to show when an object has been found.
9 Large objects are easier to find than small objects.
10 A coin horizontal to the surface is more difficult to detect than one vertical to the surface.