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Two identical bar magnets are placed end to end with like poles facing. They

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

Answer: A

Like poles repel exactly as like charges do, and the force falls rapidly with separation because each magnet is a dipole. Reversing one of them turns the repulsion into an attraction of the same magnitude at the same spacing.

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