24. Electric Force & Field; Gauss' Law

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?

Consider a rectangular array of identical point charges, each with charge $q$, arranged in a $2\times 3$ grid. If the distance between adjacent charges is $a$, what is the net electric force on the charge located at the center of the array due to the other charges?

Which process allows the transfer of electric charge $q$ from one object to another without direct contact between them?

Which of the following devices is commonly used for spike suppression in both direct $DC$ and alternating $AC$ current circuits?

When an ideal ammeter is connected in series with a battery and a resistor, what is the reading on the ammeter if the battery provides a constant voltage $V$ and the resistor has resistance $R$?

An electron is released from rest at a point far away from a stationary point charge $Q$. What is the final speed $v_{\mathrm{final}}$ of the electron when it is $10.0\mathrm{cm}$ from the charge, assuming only electrostatic forces act and neglecting gravity? (Let the electron's mass be $m$ and charge $-e$.)

Given the symbol $○-$, which component in a circuit does it represent?

Arc welding is powered by which of the following types of electric current?

An electric arc will jump most easily when the potential difference between two conductors is: $V$

Two small spheres spaced $20.0 \mathrm{cm}$ apart have equal charge. If the force between them is measured to be $4.5\times {10}^{\mathrm{-4}}$ N, what is the magnitude of the charge on each sphere? (Assume the spheres are in vacuum and use $k=8.99\times {10}^9$ N·m$2^{\mathrm{-2}}$/C$2^1$.)