Teaching Physics with the Physics Suite

Edward F. Redish

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Magnetic field, force, and torque

On the figure at the left below are a set of long current-carrying wires and a bar magnet. On the figure at the right is shown a compass specifying set of direction labels. For each of the vectors (a)-(e) below, select the direction label that best gives the direction of the item. If the magnitude of the item it zero, put 0. If none of the directions are correct, put Other.

  1. the magnetic field due to the lower wire at the center of the upper wire
  2. the force on the lower wire due to the magnetic field from the upper wire
  3. the net torque acting on the upper wire
  4. the magnetic field due to the currents at the center of the magnet
  5. the net force acting on the lower wire due to the bar magnet

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Page last modified November 5, 2002: MG13