24. Electric Force & Field; Gauss' Law

A point charge $q$ is located at position $(a,0)$ on the x-axis. What is the x-component of the electric field at the origin, point O?

As an electron moves in the direction of the electric field lines, which of the following statements is true?

How is the direction of an $\mathrm{electric field}$ defined?

For a point charge located at the origin, what is the direction of the electric field at any point on the $z$ axis?

Which of the following statements about electric field lines for point charges is incorrect?

If a point charge $q$ is located at a distance $r$ from point C in vacuum, the magnitude of the electric field at point C is:

Which of the following best describes what electric $E$ and magnetic $B$ fields contain and transport?

Consider two points, A and B, located at distances $r=1$ m and $r=2$ m from a point charge, respectively. At which point is the electric field stronger?

All electric currents generate __________ fields.

In the figure, the electric field lines on the left are shown to be closer together than those on the right. What does this indicate about the strength of the electric field on the left compared to the right?

New units of the electric field were introduced in this chapter. Which of the following are the correct new units for electric field?

Which of the following best illustrates the electromagnetic force in action?

A point charge of $\mathrm{+2}\mu C$ is located at the origin. Determine the magnitude and direction of the electric field at point 1, which is $0.5m$ to the right of the origin along the x-axis.

A point charge $q$ is located at position $(a,0)$ on the x-axis. What is $E_x$, the x-component of the electric field at the origin $(0,0)$?

Which field is produced around a wire when an electrical current flows through the wire?