Q.

Metallic micro electrodes have impedance compared to conventional electrodes?

A. equal
B. smaller
C. high
D. very high
Answer» D. very high
Explanation: The very high impedance of the metal micro-electrodes is due to the characteristics of the small area metal-electrolyte interface. Because of very high impedance of micro electrodes, amplifiers with extremely high input impedance are required to avoid loading the circuit and to minimize the effects of small change in interface impedance.
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