The potential drop in the arc, in a mercury arc rectifier, varies_____________?

A. 0.05 V to 0.2 V per cm length of the arc

B. 0.5 V to 1.5 V per cm length of the arc

C. 2 V to 3.5 V per cm length of the arcCorrect Answer

D. none of the above

Correct Option: C. 2 V to 3.5 V per cm length of the arc

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