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WorksheetsConceptual Physics Ch 22
Total questions: 27
Worksheet time: 14mins
Name
Class
Date
1.
The net charge of an atom equals
a)
the number of protons in its nucleus.
b)
the number of electrons surrounding its nucleus.
c)
zero if the atom is electrically neutral.
d)
always zero.
2.
If a neutral atom has 22 protons in its nucleus, the number of surrounding electrons is
a)
less than 22.
b)
22.
c)
more than 22.
d)
sometimes any of these in a neutral atom.
3.
A negative ion has more
a)
electrons than neutrons.
b)
electrons than protons.
c)
protons than electrons.
d)
neutrons than protons plus electrons.
4.
According to Coulomb's law, the force between a pair of charged particles that are brought closer together
a)
decreases.
b)
increases.
c)
increases only if the charges are of the same sign.
d)
increases only if the charges are of opposite signs.
5.
When a pair of charged particles are brought twice as close to each other, the force between them becomes
a)
twice as strong.
b)
4 times as strong.
c)
half as strong.
d)
one-quarter as strong.
6.
Unlike Newton's law of gravity, Coulomb's law involves
a)
force at a distance.
b)
a proportionality constant.
c)
an inverse-square law.
d)
repulsive as well as attractive forces.
7.
When you scuff electrons off a rug with your shoes, your shoes become
a)
negatively charged.
b)
positively charged.
c)
ionic.
d)
electrically neutral.
8.
When a cloud that is negatively charged on its bottom and positively charged on its top moves over the ground below, the ground acquires
a)
a negative charge.
b)
a positive charge.
c)
no charge since the cloud is electrically neutral.
d)
an electrically grounded state.
9.
When a negatively charged balloon is placed against a wooden door, positive charges in the wall are
a)
attracted to the balloon.
b)
repelled from the balloon.
c)
too bound to negative charges in the door to have any effect.
d)
neutralized.
10.
If it takes 10 newtons of force to hold a 0.1-coulomb particle at rest in an electric field, the strength of the field there is
a)
1 N/C
b)
10 N/C
c)
100 N/C
d)
1000 N/C
11.
Electrons on the surface of a conductor will arrange themselves such that the electric field
a)
inside cancels to zero.
b)
follows the inverse-square law.
c)
tends toward a state of minimum energy.
d)
is shielded from external charges.
12.
The electrical potential energy of a charged object depends on
a)
the mass of the object creating the electric field.
b)
its mass.
c)
whether it is positive or negative.
d)
none of these.
13.
If you do 12 J of work pushing a charged object against an electric field, and the object initially had an electrical potential energy of 20 J, the object's electrical potential energy is now
a)
32 J
b)
8 J
c)
-8 J
d)
20 J
14.
Normally, a rubber balloon charged to thousands of volts has a relatively
a)
large amount of charge.
b)
small amount of energy.
c)
small electric potential.
d)
small electric field.
15.
A superconductor has the property of
a)
changing from a conductor to an insulator.
b)
becoming conducting when illuminated with light.
c)
having a low electrical resistance.
d)
All of these.
16.
Electric potential and electric potential energy are
a)
one and the same in most cases.
b)
two terms for the same concept.
c)
different things with the same units.
d)
different things with different units.
17.
Voltage is electric potential energy per unit charge measured in units of
a)
Volts.
b)
Joules.
c)
Coulombs.
d)
Amperes.
18.
The thing that we measure in joules per coulomb is
a)
electric force.
b)
electric field.
c)
electric current.
d)
electric potential (aka voltage).
19.
When the distance between two charges is halved, the electrical force between them
a)
halves.
b)
doubles.
c)
is reduced by 1/4.
d)
quadruples.
20.
Particle A has twice the charge of nearby particle B. Compared to the force on Particle A, the force on Particle B is
a)
twice as much.
b)
the same.
c)
half as much.
d)
four times as much.
21.
Two charged particles held a certain distance apart are released. As they move, the force on each particle increases. Therefore, their charges have
a)
the same size.
b)
the same sign.
c)
the same mass.
d)
opposite signs.
22.
When a car is struck by lightning, the resulting electric field inside the car is
a)
zero.
b)
normally huge, but for a brief time.
c)
small enough to be safe for a passenger inside.
d)
larger if it is raining.
23.
The direction of an electric field is the direction of the force exerted on
a)
an electron.
b)
a neutral test charge.
c)
a molecule.
d)
a proton.
24.
The electric field between oppositely-charged parallel plates is
a)
stronger near the plates.
b)
uniform.
c)
composed of field lines in opposite directions.
d)
none of these.
25.
Electric potential, measured in volts, is the ratio of electric energy to the amount of electric
a)
voltage.
b)
current.
c)
resistance.
d)
charge.
26.
If 10 J of work is used in pushing 2 C of charge into an electric field, its electric potential relative to its starting position is
a)
10 V
b)
5 V
c)
20 V
d)
None of these.
27.
Lillian safely touches a 100,000-volt Van de Graaff generator. Although the voltage is high, the relatively small amount of charge means a relatively small amount of
a)
polarization.
b)
conduction.
c)
energy transfer.
d)
electric field.
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