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Problem 27.4: Force on moving charges in a current carrying wire: find the direction of the field

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The animation illustrates charged particles flowing through a wire (position is given in millimeters and time is given in seconds). A current consists of charges moving (1C/s = 1 ampere) through a conducting wire. Remember that in a conductor, charges are free to move in response to forces. Initially, there is no magnetic field in the region shown. The particles travel in one direction. Restart.

  1. What is the direction of the current in each case?
  2. What is the direction of the magnetic field in each case?

Problem authored by Morten Brydensholt and modified by Anne J. Cox.

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