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The Hall voltage across a current-carrying strip in a transverse field arises because

  • A.the carriers lose energy to the lattice as they are deflected
  • B.the carriers are deflected to one edge until an electric field balances the force
  • C.the resistance of the strip rises in a magnetic field
  • D.the field induces an electromotive force by Faraday's law

Answer: B

Deflected carriers accumulate on one side, and the transverse electric field they build up grows until it just cancels the magnetic force on the remaining carriers. Its sign reveals whether the carriers are electrons or holes, which is how semiconductor type is determined.

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