In order to have a constant current through wire, the potential difference across its end should:
Be zero
Be maintained constant
Goes on increasing
Go on decreasing
Both (A) and (B)
No lines cross this area
Maximum lines pass through this area
The number of lines are between zero and maximum
Both (A) and (B) correct
None of these
Equal
Different
Greater than one
Smaller than one
Both (B) and (C)