24. Electric Force & Field; Gauss' Law

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$2^1$.)

When a power source supplies a prescribed voltage and is used to power a light bulb, which quantity describes the amount of electric charge passing through the bulb per unit time?

A point charge of magnitude $q$ is placed at the center of a cube with sides of length $l$. What is the electric flux through one face of the cube?

In a circuit with an ammeter connected, which change would cause the needle on the ammeter to point to the left of the zero, indicating a reversal in the direction of electric current?

Given that the figure (Figure 1) shows the voltage and current graphs for an inductor, which of the following statements is correct about the phase relationship between voltage and current in an ideal inductor?

An electromagnet can be made by wrapping wire around which type of object?

In a circuit with two identical light bulbs, $A$ and $B$, connected in series to a battery, what happens to the brightness of bulb $A$ if bulb $B$ is removed from the circuit (leaving only bulb $A$ connected to the battery)?