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# what is the origin of magnetoresistance in semiconductors?

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- CurlyLv 61 decade agoFavorite Answer
Here is what I understand your questions to be:

If you have a "wire" made of a semiconductor with a current flowing through it, and you place a magnet perpindicular and adjacent to it, the aparent resistance increases. Is this what you are asking about?

If it is then you are observing the hall effect. An electron is accelerated in a direction perpindicular to its direction of travel when it is placed in a magnetic field. This "force" pushes the electrons to one side of the wire, and reduces or interferes with their normal propagation. You could say the magnet reduces the local mean free path of the electrons. The overall effect is an increase in resistance.

Source(s): http://en.wikipedia.org/wiki/Hall_effect

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