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Duplicate of Electricity and Magnetism Flashcards | StudBud
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Duplicate of Electricity and Magnetism
Duplicate of Electricity and Magnetism
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Quiz bowl review for Unit V in Physics over Electricity and Magnetism.
Flashcards
29 cards
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Questions
29
Answers
1
Examples of induction include all of the following EXCEPT:
A Van de Graff generator
A thunderstorm passing over a tall building
A iron core with a current carrying wire wrapped around it.
A charged balloon passing over paper chads (circles)
2
The discrepancy between the orientation of a compass and true north is known as the
none of the above.
magnetic declination.
radioactive effect.
magnetic effect.
3
How does a metal scrap yard use an electromagnet to pick up large objects like cars?
Generators that do mechanical work
Induction
Large rare-earth magnets
Very high voltages
4
When a charged cloud passes overhead, the ground below is charged by
electrification.
induction
polarization.
deduction.
5
What components of a circuits are used to convert AC to DC?
capacitor and a diode
capacitor and a generator
a convertor and a conducting wire
diode and a generator
6
If you comb your hair and the comb becomes positively charged, your hair becomes
negatively charged
positively charged
uncharged
7
Where do the electrons come from that produce heat and light in a light bulb?
the air
the power company
the wall plug
the bulb's wire filament
8
The direction of electric field lines shows the
all of the above
strength of the field.
direction of the force on a test positive charge.
size of the field.
9
What are three ways an object can become charged include:
induction, conduction, and friction
induction, convection, and friction
deduction, conduction, and friction
induction, conduction, and magnetism
10
When an 8V battery is connected to a resistor, 2 A current flows. What is the resistance?
4 ohms
8 ohms
2 ohms
16 ohms
11
48 J of work push a 0.1 C charge from A to B in an electric field. What is the voltage?
0.48 V
4.8 V
480 V
4,800 V
12
Loops of wire in a motor rotate because a
battery effectively pushes a loop around in the field.
current exerts a force on the loop, causing it to rotate.
magnetic field exerts force on moving electrons in the loop.
magnet attracts stationary electrons in the wire.
13
What charge is associated with 100 electrons?
-1.6 x 10-17 C
-1.6 x 10-19 C
1.6 x 10-19 C
1.6 x 10-17 C
14
The differences between Coulomb's law and Newton's law of gravitation include all EXCEPT:
Electrical forces may be shielded.
Electrical forces are much greater than Gravitational forces
Electrical forces may be repulsive
Fields of force are created by similar subatomic particles
15
After you rub a balloon on your hair, the balloon will likely be charged
to several hundred volts.
to several thousand volts.
not at all.
to less than 10 volts.
16
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.
17
Charge carriers in a metal are electrons rather than protons, because electrons are
all of the above
lighter.
loosely bound.
relatively far from a nucleus.
18
The fundamental difference between voltage and electric potential energy is:
E = F / q
V = EPE / q
V2 = PR
I = q / t
19
An example of a voltage source is
a generator.
a car battery.
all of the above
a dry cell.
20
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.
Both A and B above
potential difference between the two places.
21
Electric fields outside a Van de Graaff generator are enormous, inside the dome, the field is
zero.
almost as enormous.
even more enormous.
22
The primary reason a bird can perch harmlessly on bare high voltage wires is that
a bird has a very large electrical resistance.
all of the above
there is no potential difference across the bird's feet.
a bird's feet are close together.
23
What is the current in a 60 W bulb connected to a 120 V source?
2 A
4 A
0.5 A
0.25 A
24
In which direction does the electric field point when the test charge is negative?
Away from the positively charged body
Toward a positively charged body
Perpendicular to a positively charged body
Parallel to a positively charged body
25
The frequency of AC current in North America is
120 V.
30 V.
60 hertz.
50 hertz.
26
Every proton in the universe is surrounded by its own
none of the above
both A and B
gravitational field.
electric field.
27
The similarities between Coulomb's law and Newton's law of gravitation include all EXCEPT:
inverse-square law
Forces are only attractive
directly proportional to charge/mass
constants determined experimentally
28
What power is dissipated by a toaster with a 40 Ω resistance plugged into 120V outlet.
3 A
360 W
4800 W
3 W
29
Electrical resistance in a wire depends on the wire's
all of the above
length.
thickness.
conductivity.
