Answer Posted / anup ramteke

Answers 5, 6 & 7 are correct. just want 2 add that why cant
we use 3 mA current as lower value. The reason is that there
are many small noise signals that can be picked up by our
signal wire which has the potential of providing upto 3 mA
current. So to be on the safe side to distinguish between
our proper field signal and the noise pick-ups we use 4 mA
as our lower value

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