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The law of intermediate metals states that a third metal introduced into a thermocouple circuit

  • A.halves the emf generated by the original pair of metals
  • B.does not affect the emf if its two junctions are at the same temperature
  • C.always adds an emf of its own which must be subtracted from the reading
  • D.may be used only if it lies between the other two in the thermoelectric series

Answer: B

This is what allows copper leads, solder and instrument terminals to be introduced without upsetting the measurement, provided each pair of junctions is isothermal. Without it a thermocouple could not be connected to anything.

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