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Electricity and Magnetism
Electricity and Magnetism
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Quiz bowl review for Unit V in Physics over Electricity and Magnetism.
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1
An example of a voltage source is
all of the above
a car battery.
a dry cell.
a generator.
2
How does a metal scrap yard use an electromagnet to pick up large objects like cars?
Generators that do mechanical work
Induction
Very high voltages
Large rare-earth magnets
3
The frequency of AC current in North America is
120 V.
30 V.
50 hertz.
60 hertz.
4
Loops of wire in a motor rotate because a
current exerts a force on the loop, causing it to rotate.
battery effectively pushes a loop around in the field.
magnetic field exerts force on moving electrons in the loop.
magnet attracts stationary electrons in the wire.
5
To say that electric charge is conserved means that no case has ever been found where
the total charge on an object has changed.
the total amount of charge on an object has increased.
net charge has been created or destroyed.
one object has more charge than another object.
6
Electrical polarization occurs when
an atom vibrates in a single direction.
charge distribution in a neutral molecule separates.
the electron and the proton are on different sides
an electron is at a different location than a proton.
7
When a charged cloud passes overhead, the ground below is charged by
polarization.
induction
deduction.
electrification.
8
Charge carriers in a metal are electrons rather than protons, because electrons are
all of the above
relatively far from a nucleus.
loosely bound.
lighter.
9
Electric fields outside a Van de Graaff generator are enormous, inside the dome, the field is
almost as enormous.
zero.
even more enormous.
10
The similarities between Coulomb's law and Newton's law of gravitation include all EXCEPT:
Forces are only attractive
directly proportional to charge/mass
inverse-square law
constants determined experimentally
11
What are three ways an object can become charged include:
induction, convection, and friction
deduction, conduction, and friction
induction, conduction, and friction
induction, conduction, and magnetism
12
What is the current in a 60 W bulb connected to a 120 V source?
2 A
0.5 A
4 A
0.25 A
13
The differences between Coulomb's law and Newton's law of gravitation include all EXCEPT:
Electrical forces may be repulsive
Electrical forces are much greater than Gravitational forces
Electrical forces may be shielded.
Fields of force are created by similar subatomic particles
14
What charge is associated with 100 electrons?
-1.6 x 10-19 C
1.6 x 10-19 C
-1.6 x 10-17 C
1.6 x 10-17 C
15
In order for there to be a flow of charge from one place to another, there must be a
conductor, such as a wire, connecting the two places.
potential difference between the two places.
Both A and B above
16
What power is dissipated by a toaster with a 40 Ω resistance plugged into 120V outlet.
3 W
4800 W
3 A
360 W
17
Where do the electrons come from that produce heat and light in a light bulb?
the bulb's wire filament
the wall plug
the power company
the air
18
The direction of electric field lines shows the
size of the field.
direction of the force on a test positive charge.
all of the above
strength of the field.
19
If you comb your hair and the comb becomes positively charged, your hair becomes
uncharged
negatively charged
positively charged
20
Electrical resistance in a wire depends on the wire's
all of the above
thickness.
conductivity.
length.
21
In which direction does the electric field point when the test charge is negative?
Away from the positively charged body
Parallel to a positively charged body
Perpendicular to a positively charged body
Toward a positively charged body
22
When an 8V battery is connected to a resistor, 2 A current flows. What is the resistance?
8 ohms
16 ohms
4 ohms
2 ohms
23
Every proton in the universe is surrounded by its own
none of the above
both A and B
electric field.
gravitational field.
