24. Electric Force & Field; Gauss' Law

Two point charges are fixed on the y-axis at positions $(0,a)$ and $(0,-a)$. If both charges have magnitude $q$ but opposite signs, what is the direction of the electric field at the origin?

In a simple circuit consisting of a battery of emf $E$ and an external resistor $R$, the battery current $i$ is:

Which term describes the process in which electric charge is redistributed within a material, causing one side to become $\mathrm{positive}$ and the other $\mathrm{negative}$?

A thundercloud has a radius of $R$ and is at a potential of $V$ relative to the ground. If the breakdown electric field of air is $E_{\text{break}}$, what is the approximate total charge $q$ on the cloud when the breakdown of the surrounding air is reached?

Four identical point charges, each of charge $q$, are placed at the corners of a square of side $a$. What is the magnitude of the net electric force experienced by one of the charges due to the other three?

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?

A utility worker was trimming branches near a power line and was electrocuted. Which of the following best explains why this happened?

Which fundamental force is responsible for the interaction between charged particles?

Four identical point charges $q$ are placed at the corners of a square of side $l$. What is the magnitude of the net electrostatic force experienced by one of the charges due to the other three?

Suppose that in a lightning flash the potential difference between a cloud and the ground is $1.0\times {10}^8$ volts and the charge transferred is $30$ coulombs. What is the energy delivered by the lightning flash?

Which of the following would cause the light bulb to glow in a simple circuit involving a battery, wires, and a light bulb?

In alternators, the welding current is produced on the ____.

An insulator is any material that?

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

When measuring voltage using a voltmeter, how should the voltmeter be connected to the circuit?