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Two long parallel conductors carrying currents in the same direction

  • A.exert no force on one another
  • B.exert a torque but no net force upon one another
  • C.attract one another
  • D.repel one another

Answer: C

Each lies in the circumferential field of the other, and working out the cross product shows the force to be inward. This is the reverse of the electrostatic case, where like charges repel, and it was formerly the basis of the definition of the ampere.

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