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Lenz's law expresses the fact that an induced current

  • A.ceases as soon as the flux stops changing sign
  • B.opposes the change of flux that produced it
  • C.flows in the direction of the applied flux
  • D.is proportional to the flux rather than its rate of change

Answer: B

Any other sense would let the induced current reinforce the change and the arrangement would run away, creating energy from nothing. The law is therefore a statement of energy conservation as much as of electromagnetism.

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