Mercury, in arc rectifiers, is chosen for cathode because________________?
Correct answer: E. all of the above
- A. its ionization potential is relatively low
- B. its atomic weight is quite high
- C. its boiling point and specific heat are low
- D. it remains in liquid state at ordi¬nary temperature
- E. all of the above
Explanation
Mercury is suitable as a cathode because it is liquid at room temperature, has relatively low ionisation potential, and its heavy atoms support arc conduction; its relatively low boiling point and specific heat also aid operation. Thus all the stated properties contribute.
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