What is the smallest number of polarities required for current flow?

1.	What is the smallest number of polarities required for current flow?
A.	One - a negative terminal
B.	Two - a negative terminal and a positive terminal
C.	Three - negative, positive and neutral terminals
D.	Four - two negative and two positive
E.	None of the above
Answer» C. Three - negative, positive and neutral terminals

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What is the smallest number of polarities required for current flow?

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