Khác biệt giữa bản sửa đổi của “Muggles' Guide to Harry Potter/Magic/Underage Sorcery”
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In [[Muggles' Guide to Harry Potter/Books/Deathly Hallows|''Harry Potter and the Deathly Hallows'']], we learn that the technique that is used to determine whether a Wizarding child has performed magic is called the Trace. This apparently will detect magic used by the child and trigger some indication in the Ministry. Apparently, in order to be sensitive enough to register the child's use of small spells, it will also detect magic used near the child. We are told that in Wizarding households, it is the parents who are responsible for monitoring the use of magic by the child, as the adults using magic near him may trigger the Trace accidentally; [[Muggles' Guide to Harry Potter/Magic/Muggle-born|Muggle-born]] wizards, however, are directly monitored by the Ministry, as it is assumed that the only magic that can occur near them is their own. This is presumably why Dobby's Hover charm was attributed to Harry.
One must wonder, though, about the accuracy of the Trace
This still leaves issues with the Trace remaining quiescent when the Twins and Ron are in Arthur's flying car, when Harry joins them, and when Harry and Ron are in the car. Certainly the car is a magical artifact, and so the Trace should be active, but none of the underage wizards involved in that escapade receive warnings. Another writer, in another series (Randall Garrett, in the ''Lord Darcy'' series), has drawn a distinction between active and passive magic, saying that possessing or using a charmed object is significantly different than actively creating a new spell. It is probably necessary that this same distinction be built into the Trace, as the number of charmed objects in the ordinary Wizarding household that would be used by a child is quite extensive — an infant banging on a self-stirring cauldron with a spoon, for instance, could be considered someone using a magical object. If this distinction was not made by the Trace itself, the Ministry would be overwhelmed with reports of use of magical objects by underage wizards.
== Questions ==
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