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Loading error in a voltage measurement arises because the voltmeter

  • A.responds to the frequency of the quantity being measured
  • B.draws current from the circuit under test
  • C.has a resistance that is far too high for the circuit
  • D.is calibrated against a standard of insufficient accuracy

Answer: B

Shunting the circuit with a finite resistance changes the very voltage being measured, and the effect grows as the circuit's own resistance approaches the meter's. A high input impedance is what makes the error negligible.

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