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(C) The effective current $I$ is defined as the net rate of flow of charge. $A$ positive charge moving in one direction is equivalent to a current in

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$i = ii = iii > iv$

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(C) The effective current $I$ is defined as the net rate of flow of charge. $A$ positive charge moving in one direction is equivalent to a current in that direction,while a negative charge moving in the same direction is equivalent to a current in the opposite direction.For figure $(i)$: $A$ positive charge moves to the right at $7 \ C/s$. Thus,$I_1 = 7 \ A$.For figure $(ii)$: $A$ positive charge moves to the right at $4 \ C/s$ and a negative charge moves to the left at $3 \ C/s$. Both contribute to a current to the right. Thus,$I_2 = 4 + 3 = 7 \ A$.For figure $(iii)$: $A$ positive charge moves to the right at $5 \ C/s$ and a negative charge moves to the left at $2 \ C/s$. Both contribute to a current to the right. Thus,$I_3 = 5 + 2 = 7 \ A$.For figure $(iv)$: $A$ negative charge moves to the left at $6 \ C/s$ (equivalent to $6 \ A$ to the right) and a positive charge moves to the left at $1 \ C/s$ (equivalent to $1 \ A$ to the left). Thus,$I_4 = 6 - 1 = 5 \ A$.Comparing the values,we get $I_1 = I_2 = I_3 = 7 \ A$ and $I_4 = 5 \ A$. Therefore,$i = ii = iii > iv$.

The following figure shows four situations in which positive and negative charges move horizontally through a region and gives the rate at which each charge moves. Rank the situations according to the effective current through the region,greatest first.

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