24. Electric Force & Field; Gauss' Law

An insulating sphere of radius $a$, centered at the origin, has a uniform volume charge density $\rho$. What is the total charge contained within the sphere?

Which of the following objects would not be a good insulator of $\mathrm{electric charge}$?

A thin rod of length $L$ has a uniform linear charge density $\lambda$. What is the total charge $Q$ on the rod?

When using an electrical device, is it safe or unsafe to use a three-prong plug with the ground post missing?

Which statement about a clamp-on ammeter is correct regarding its ability to measure electric current?

Three point charges are located along the x-axis at positions $3\mathrm{cm}$, $8\mathrm{cm}$, and $11\mathrm{cm}$. If the charges at $3\mathrm{cm}$ and $11\mathrm{cm}$ are both $\mathrm{+2}\mathrm{\mu C}$ and the charge at $8\mathrm{cm}$ is $-2\mathrm{\mu C}$, what is the net electric force (magnitude only) on the charge at $8\mathrm{cm}$? (Assume all charges are in vacuum and use $k=9\times 109^N{m}^2{C}^{-2}$)

If a material does not allow electric charges to move through it easily, what is this type of material called?

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 electric force on any one of the charges due to the other two?

Given that the current in a circuit is described by $i\left(t\right)=i_0{e}^{-bt}$ where $b>0$, which of the following best describes the behavior of the total charge $Q$ that flows through the circuit as $t\to \infty$?

Electrons in a wire move from point $a$ to point $b$. What is the direction of the conventional current that flows in the wire?

In a simple series circuit consisting of a battery and three identical resistors labeled $a$, $b$, and $c$ in series, at which point in the circuit is the electric current the largest: $\left(a\right)$ before the first resistor, $\left(b\right)$ between the first and second resistor, $\left(c\right)$ between the second and third resistor, or $\left(d\right)$ after the third resistor?

Which type of electric current is typically used in flashlights and batteries?

After several contacts with a charged ball, how is the electric charge $q$ distributed on a metal rod?

Which particle has a charge with magnitude $1.602\times {10}^{-19}C$?

In a simple electric circuit powered by a battery, what happens if you disconnect the wire from the $+$ terminal of the battery?