Q.

The initiation of electric arc at the instant of contact separation is caused by

  • AThermionic emission of electrons
  • BField emission of electrons
  • C(a) and (b) both
  • DNone of the above 
Correct Answer : (C)

(a) and (b) both

Hints :

The initiation of electric arc at the instant of contact separation is caused by Thermionic emission of electrons and Field emission of electrons.

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