24. Electric Force & Field; Gauss' Law

When a person who is touching a Van de Graaff generator also touches the ground, what is the most likely outcome?

Which of the following statements about electric charge is true?

When no current flows in a conductor, free electrons move randomly, and their magnetic fields cancel. Which of the following best describes the motion of free electrons in this situation?

Which property of batteries allows them to power devices such as radios, watches, and cell phones?

In a simple electric circuit containing a battery, a resistor, and connecting wires, the electrons moving through the circuit in the attached figure will go through the resistor in which direction relative to the battery terminals?

To start a car engine, the car battery moves which of the following through the starter motor circuit?

All of the following statements are true about $240-\mathrm{volt}$ current except:

Three point charges of equal magnitude $q$ are placed at the corners of an equilateral triangle of side length $a$. What is the magnitude of the net force on any one charge due to the other two?

Which of the following devices is used to measure electrical resistance in $\Omega$?

What is the primary purpose of a lightning rod?

In a circuit containing a $C$ (capacitor), $R$ (resistor), and battery in series, what is the current through the resistor immediately after the switch is closed?

Four point charges are placed at the corners of a square of side $l$. Each corner has a charge of $q$, and all charges are positive. What is the magnitude of the net electric force on one of the charges due to the other three?

If two point charges are separated by a fixed distance and each of the charges doubles, what happens to the magnitude of the electrostatic force between them according to Coulomb's law ($F=\frac{\mathrm{k\; q\_1\; q\_2}}{r^2}$)?

Which of the following is a similarity between $B$ (magnetic fields) and $E$ (electric fields)?

Which of the following is required for an electric charge $q$ to flow through a wire?