24. Electric Force & Field; Gauss' Law

A typical lemon battery can be made by inserting a zinc nail and a copper coin into a lemon. Estimate the electric current ($I$, in amperes) that such a lemon battery can deliver under normal conditions.

In the context of electric charge and machines, reconnecting a running motor so that it operates as a generator is known as:

Which of the following best differentiates between direct current $\mathrm{DC}$ and alternating current $\mathrm{AC}$?

After a switch in a circuit containing a capacitor of capacitance $C$ and initially uncharged is closed and connected across a battery of emf $V$, how much charge flows through the switch until the capacitor is fully charged?

For the circuit above, if a resistor of resistance $R$ is connected in series with a battery of emf $V$, what is the electric charge that flows through the resistor in time $t$?

Which of the following is an example of static electricity?

Which best explains why an electric toaster is considered a resistor?

Four point charges of equal magnitude $q$ are placed at the corners of a square of side $a$. If all charges are positive, what is the magnitude of the net electric force on one of the charges due to the other three?

How many coulombs of electric charge are contained in $1$ $A$-$h$?

Which term describes the transfer of electric charge between two objects that are not in direct contact with each other?

If two point charges $q_1$ and $q_2$ are located at distances $r_1$ and $r_2$ from a third charge $q$, and all three charges are aligned along a straight line, what is the magnitude of the total electric force that $q_1$ and $q_2$ exert on $q$?

In the context of electromagnetic waves generated by an oscillating electric charge, what does the frequency $f$ of the emitted electromagnetic field represent?

Why are metals generally good conductors of electric current $I$?

What is a very important difference between $\mathrm{electric} \mathrm{charges}$ and $\mathrm{magnetic} \mathrm{poles}$?

Which of the following instruments is used to measure the resistance to electrical current ($R$)?