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physics last test static electricity packet with 100- correct answers.
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physics last test staticelectricity packet with
100% correct answers
1. Which of the following are true of static
charges? Choose all that apply.
a Like charges repel.
b Like charges attract.
c Opposite charges repel.
d Opposite charges attract.
e A positively charged object has lost electrons.
f A positively charged object has gained protons.
g A negatively charged object has lost protons.
h A negatively charged object has gained
electrons.
Answer: ADEH
A and D are true; they are the simple statement of
our essential charge interactions, best
remembered by the jingle: "opposites attract, likes
repel."
B and C are false for these same reasons; they
violate the basic statement of charge interactions.
E and H are true. For an object to become charged,
,it must either gain or lose electrons. Losing
electrons results in more positive charge than
negative charge, making the object charged
positively. Gaining electrons results in more
negative charge than positive charge, making the
object charged negatively. Protons are tightly
bound in the nucleus of atoms and can never be
added nor removed from atoms by ordinary
electrostatic methods. The same reasoning leads
one to reject choice F and G as possible true
statements; the suggest that protons can be added
or removed.
7. The outer shell electrons in metals are not
tightly bound to the nuclei of their atoms. They are
free to roam throughout the material, moving from
atom to atom. These materials are good ____.
conductors
insulators
for nothing
Answer: A
Metals are great conductors. That is, electrons are
free to move across the surface of metals,
migrating from atoms to atoms. Being conductors,
metals can serve as pathways for the movement of
electrons from atom to atom, molecule to
molecule, and object to object. All of this is due to
the fact that the outer electrons (also known in
some chemistry circles as valence electrons) are
not tightly bound to the nuclei of their atoms.
, We have an expert-written solution to this
problem!
For Questions #8 and #9, consider the following
situation. Connor Duct (Con to his friends) takes a
positively charged rubber rod and touches a metal
sphere on an insulated stand as shown at the
right. Draw the direction of electron flow.
8. The charge on the metal sphere will end up ___.
neutral
negative
positive
Answer: C
This is an example of charging by contact. When a
neutral object is charged by contact, the object
acquires the same type of charge as the object
used to charge it. In this case, the sphere acquires
the same type of charge as the rubber rod - a
positive charge. (As for how this happens, see the
next question.)
9. The sphere acquires this charge because ____.
electrons move from the rubber rod to the sphere
electrons move from the sphere to the rubber rod
protons move from the rubber rod to the sphere
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