24. Electric Force & Field; Gauss' Law

A certain cylindrical wire carries a steady current. Which of the following statements about the distribution of electric charge within the wire is correct?

If a toy car has a current of $1.5 A$ flowing through it for $10 s$, how much electric charge passes through the car during this time?

A proton with an initial speed of $900000m/s$ is brought to rest by a uniform electric field. What is the direction of the electric field relative to the proton's initial motion?

Two equally charged particles are held $3.2$ meters apart in vacuum. If the electrostatic force between them is $2.0\times {10}^{-6}$ newtons, what is the magnitude of the charge on each particle?

When a large electric current flows through a straight horizontal wire from west to east, in which direction will the north pole of a magnetic compass placed directly above the wire point?

Which of the following best describes the fundamental difference between a generator and an electric motor in terms of energy conversion?

Rubbing a balloon on your hair to give it a charge is an example of which method of charging?

Which of the following could be the net charge found on an object?

If a proton and an electron are released when they are $2.0\times {10}^{-10}$ m apart (a typical atomic distance), find the initial acceleration of each particle.

Which of the following is the correct conversion factor between $\mathrm{warmombs}$ and $\mathrm{coulombs}$?

How is a charged object able to move other objects from a distance?

Object A has a charge of $+2\mu C$. Which of the following statements is correct about the nature of its charge?

When two objects are charged through friction, how do the magnitudes and signs of their electric charges compare?

Which of the following materials are efficient charge carriers ($\mathrm{conductors}$)?

In a typical metallic wire, what is the direction of conventional current relative to the motion of electrons?