1
Consider 2 identical metal spheres that are
mounted on insulating stands. Sphere X has a
charge -1q, and sphere Y has a charge +4q. The
spheres are now touched together and then
separated.
a. Each is now charged, with a charge +1.5 q
b. Each is now charged, with a charge +2.5 q
c. Each is now charged, with a charge +3 q
d. Sphere X has charge +4 q, sphere Y now has
charge -1 q
e. none of these
2
Electrical charge interaction can be
summarized by:
a. - charge repels other - charge.
b. + charge repels other + charge.
c. - charge and + charge attract each other.
d. All of these.
e. None of these.
3
Amy uses a piece of silk to rub a comb.
The comb then becomes positively
charged. This net positive charge
accumulates because the comb
– A. gains electrons
– B. gains protons.
– C. loses electrons.
– D. loses protons.
4
The diagram shows the electric field lines
between two electrical charges P and Q.
Which of the following statements about the
charges on P and Q is correct?
• A. P is positive and Q is negative.
• B. P is negative and Q is positive.
• C. P and Q are both positive.
• D. The electric field lines only show the
intensity of the electric field but not the
charges.
5
A child rubs a rubber ruler and then puts it
near some tiny pieces of paper. The paper
pieces are then attracted to the ruler.
Which of the following statements best
explains the result?
– A. Paper is naturally a negative material.
– B. Rubber and paper always attract each other.
– C. The paper becomes charged by induction.
– D. The paper acquires a net positive charge by
induction.
6
A charge Q exerts a 12 N force on another
charge q. If the distance between the
charges is doubled, what is the magnitude
of the force exerted on Q by q?
• A) 3 N
• B) 6 N
• C) 24 N
• D) 36 N
• E) 48 N
7
How does a material acquire a positive
electrical charge?
A) By losing electrons.
B) By gaining protons.
C) By gaining electrons.
D) By switching the position of electrons
and protons in the atom.
8
A material that easily allows the flow of
electric charge through it is called a (an)
A) insulator.
B) conductor.
C) semiconductor.
D) superconductor.
9
In an electric field diagram, how would
a very weak electric field intensity be
indicated?
A) The field lines are very close
together.
B) The field lines are very long.
C) The field lines are very far apart.
D) The field lines are very short.
10
Mass is to gravitational force as ? is to
the electrostatic force.
A) Electrons
B) Weight
C) Distance
D) electric charge
11
Bring a charged object near a
conductor and then momentarily
touch the conductor. This
demonstrates charge by
• a. deduction.
• b. polarization.
• c. induction.
• d. electrification.
12
Two charged particles held close to each
other are released. As they move, the force
on each particle increases. Therefore, the
particles have
• a. opposite signs.
• b. the same sign.
• c. charges that cannot be determined
13
A volt is a unit of
• a. charge.
• b. electric potential.
• c. energy.
• d. work.
• e. current.
14
Electric potential is defined as
• a. electrical potential energy of a charge
multiplied by the quantity of the charge
• b. electrical potential energy of a charge
•
•
•
divided by the quantity of the charge.
c. electrical potential energy.
d. gravitational potential.
e. voltage.
15
An electric field has
• a. direction.
• b. magnitude.
• c. Both A and B