24. Electric Force & Field; Gauss' Law

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?

Which of the following elements is most likely to cause an $\mathrm{electric} \mathrm{shock}$ when touched under normal conditions?

In an electric circuit, the product of the source voltage $V$ and the total current $I$ is equal to which of the following quantities?

A spherical shell has inner radius $a$ and outer radius $b$, and carries a uniform volume charge density $\rho$. What is the total charge contained in the shell?

Which of the following best describes a similarity between $\mathrm{magnetic} \mathrm{poles}$ and $\mathrm{electrical} \mathrm{charges}$?

A very large plastic sheet carries a uniform charge density of $-6.00nc/m^2$ on one face. What is the magnitude of the electric field just above the surface of the sheet?

Which of the following is necessary to maintain a continuous electric current through a wire?