The vacuum inside the glass bulb of a mercury arc rectifier is of the – McqOptions

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1.	The vacuum inside the glass bulb of a mercury arc rectifier is of the order of
A.	5 x 10-3 cm of Hg
B.	5 x 10-4 cm of Hg
C.	5 x 10-5 cm of Hg
D.	5 x 10-8 cm of Hg.
Answer» D. 5 x 10-8 cm of Hg.

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