[Solved] Glass microcapillaries are preferred over metallic electrodes because of the former

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Q.	Glass microcapillaries are preferred over metallic electrodes because of the former
A.	polarizes with input current
B.	does not have sustainable current carrying capacity
C.	has less contact surface area
D.	has sustainable current carrying capacity
Answer» D. has sustainable current carrying capacity
Explanation: Metallic electrodes polarize with smaller amplifier input currents. Hence, they tend to develop unstable electrode offset potential and are therefore not preferred for steady state potential measurement. On the other hand, in case of glass micro electrodes have a sustainable current carrying capacity because of the large surface area between the metal and the electrolyte.

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