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What is meant by the capacitive current in a liquid dielectric when using AC to determine...

What is meant by the capacitive current in a liquid dielectric when using AC to determine the resistivity as explained in the sentence below:

"Alternating current resistance measurements cannot successfully be made when the conductivity of a liquid solution is too low. This is because the capacitative current in the measuring cell may be so much larger than the resistive current that it prevents the latter from being determined accurately."

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