Exam 8: Light and Electromagnetism

Suppose you charge two transparencies by rubbing and then hold them near each other but not touching. Regarding the electric and magnetic forces they exert on each other,

The filament of a lightbulb glows, while the connecting wires do not. This is because

What physics principle can be demonstrated by rubbing two transparency sheets with tissue paper and then holding them near each other?

Concerning the force holding an atom together [that is, holding the electrons into the nucleus] and the force holding the solar system together: Are these basically the same type of force?

Suppose that the electric force between two objects is 2 N and that you then halve the distance between the objects. The new force is

Which of these is the best explanation of the "electric hair" that can occur when some people brush their hair?

An atom's "atomic number" is

What is the explanation of Earth's magnetism?

Ernest Rutherford's experiments in which alpha rays pass through a thin piece of metal foil demonstrated that

Object A has an electric charge that is 10 times larger than the charge on object B. When placed near each other, how does the force by A on B compare with the force by B on A?

How does a permanent magnet work, i.e., what is the explanation of its magnetic effects?

When a battery is used to light up a lightbulb,

The types of current carried by the headlights of an automobile, and by a plug- in toaster in your kitchen, are

If you rub a transparency sheet with tissue and then hold the transparency sheet and the tissue at rest a short distance apart, they will then exert

The force between two bar magnets cannot be due to gravity, because

If a proton and an electron are placed a short distance apart,

An electromagnetic field

In a single electric cord, such as a cord that connects a wall socket with an electric light,

Since matter is made of electrically charged particles, why don't we feel electric forces all the time?

If you rub two transparency sheets with tissue and then hold the two transparency sheets at rest a short distance apart, the electromagnetic forces they exert on each other will be