railway RRB JE (CBT I + CBT II) Mock Test 2024 Production Engineering (Manufacturing) Joining Welding

आर्क विचलन किस ध्रुवता में होता है?

1
AC ध्रुवता
2
उत्क्रम ध्रुवता 
3
DC ध्रुवता
4
उदासीन ध्रुवता
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