24. Electric Force & Field; Gauss' Law

(II) What is the total charge of all the electrons in a 12-kg bar of gold? What is the net charge of the bar? (Gold has 79 electrons per atom and an atomic mass of 197 u.)

Which of the following conditions is guaranteed to continue to produce a current?

Two particles are placed a distance apart as shown in the figure. If the particles have charges $q_1$ and $q_2$ such that $q_1=-q_2$, what is true about the electric forces they exert on each other?

In which of the following situations will the lowest resistance occur?

Which of the following is the SI unit of measurement for electrical resistance?

Which of the following is the SI unit of measurement for electric current?

Four point charges of equal magnitude are placed at the corners of a square of side length $a$. If the charges at adjacent corners are of opposite sign, what is the net electric field at the center of the square?

Which of the following components is used to convert $AC$ power to $DC$ power?

During a typical lightning strike, $2.5C$ of charge flows from cloud to ground in $0.20\mathrm{ms}$. What is the average current produced by the lightning strike?

Which of the following must be true for a circuit to light a bulb?

Tracing the current path(s) in a circuit is necessary when determining which of the following quantities?

Which property do both lightning and stars have in common?

In a typical lightning strike, $2.5C$ of charge flows from cloud to ground in $0.20\mathrm{ms}$. What is the average current during the strike?

Which type of electric charge is primarily responsible for holding small dust particles together in space through electrostatic attraction?