Figure 26-19 shows four situations in which positive and negative charges move horizontally and gives the rate at which each charge moves. Rank the situations according to the effective current through the regions, greatest first.

Figure 26-19 is the region of the current’s flow.

Electrical charge carriers, such as electrons, flow as current. From negative to positive points, current flows.Taking the direction of positive charge as positive, we can find the net current in the region by adding the rate at which the charges move.

Formula:

The net current according to the current equation, $l=l_1+l_2$ …(i)

The direction of the positive charge is the direction of the current. Hence,

For region a), the net current is given by:$l_a=7\mathrm{C}/\mathrm{s}$

For region b), the net current is given using equation (i) as:

$$\begin{gathered} l_a=4+3 \\ =7\mathrm{C}/\mathrm{s} \end{gathered}$$

For region c), the net current is given using equation (i) as:

$$\begin{gathered} l_c=5+2 \\ =7\mathrm{C}/\mathrm{s} \end{gathered}$$

For region d), the net current is given using equation (i) as:

$$\begin{gathered} l_d=6-1 \\ =5\mathrm{C}/\mathrm{s} \end{gathered}$$

So the ranking of the effective current is$l_a=l_b=l_c>l_d$