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Reactance may refer to:

  • Electrical reactance, the opposition to a change in voltage due to capacitance (capacitive reactance) or in current due to inductance (inductive reactance); the imaginary component of AC impedance
  • Magnetic reactance, a similar effect in magnetism
  • Reactance (psychology), an emotional reaction to pressure or persuasion that results in the strengthening or adoption of a contrary belief

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