Figure 1 depicts an *end-on line of charge* — a line of charge of length $l$ in which the field point $P$ lies a distance $x$ from the end of the line of charge and the orientation of the line of charge is parallel to the $\hat{x}$-axis.

Figure 2 depicts a *transverse line of charge* — a line of charge of length $l$ in which the field point $P$ lies a distance $x$ from the center of the line of charge and the orientation of the line of charge is perpendicular to the $\hat{x}$-axis.

Figure 3 depicts a *ring of charge* — a circular line of charge of length $l = 2\pi \rho$ in which the field point $P$ lies a distance $x$ from the center of the ring of charge and the $\hat{x}$-axis is perpendicular to the plane containing the ring of charge.

All three lines of charge have the same charge $q = 2 \text{ nC}$ placed upon them, and all three lines have the same length $l = 4 \text{ cm}$.

Figure 4 depicts the magnitude of the electric field as a function of $x$ for the three different lines of charge. Note that the vertical axis uses a logarithmic scale.

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