24. Electric Force & Field; Gauss' Law

Which of the following devices uses direct current ($DC$) for its operation?

Which type of energy depends on the distance between two particles and the charge of each particle?

When removing a plug from a wall receptacle, is it safe or unsafe to pull on the cord instead of the plug itself, and why?

What is the term for the basic unit of electric current? The basic unit of electric current is the:

Why are metals good conductors of $\mathrm{electric} \mathrm{current}$?

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

Which type of force results from the interaction of $\mathrm{charged}$ particles?

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 on one of the charges due to the other three?

An ohm is equal to which of the following combinations of SI base units?

If a wire carries a current of $10.0 fA$ (femtoamperes), how many electrons per second flow through the wire? (Elementary charge $e=1.60\times 10{-}^{19}C$)

In the rectangle shown in the drawing, where should a positive point charge be placed so that the electric field at the center of the rectangle is $0$?

Which type of circuit is described as a noncontinuous loop that prevents the flow of current?

Suppose two point charges, $q$ and $-q$, are placed a distance $d$ apart. What is the direction of the electric field at the midpoint between the charges?

A charged particle moves through a region and does not experience any magnetic force. Which of the following could explain this observation?

In the context of electric circuits, what is the primary quantity that flows through a circuit to produce electric current ($I$)?