Which statement about a clamp-on ammeter is correct regarding its ability to measure electric current?

Since electrons are negatively charged, the direction of electron current flow is from $\mathrm{negative}$ to $\mathrm{positive}$.

A circuit contains a resistor and a capacitor in series with a battery. At time $t=0$ s, the current is $i_0$. At what time in $\mu s$ will the current decrease to $\frac{1}{2}{i}_0$?

When no current flows in a conductor, free electrons move randomly, and their magnetic fields cancel. Which of the following best describes the motion of free electrons in this situation?

In a simple series circuit consisting of a battery and three identical resistors labeled $a$, $b$, and $c$ in series, at which point in the circuit is the electric current the largest: $\left(a\right)$ before the first resistor, $\left(b\right)$ between the first and second resistor, $\left(c\right)$ between the second and third resistor, or $\left(d\right)$ after the third resistor?

If a box is placed in a region where the $E$ field lines enter the box from one side and exit from the opposite side, with the same number of lines entering and leaving, does the box contain positive charge, negative charge, or no charge?

After several contacts with a charged ball, how is the electric charge $q$ distributed on a metal rod?

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)?