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Physics Review #1
LCHS
Dr.E
In order to produce a magnetic field, an
electric charge must be
(A) stationary
(B) moving
(C) positive
(D) negative
The diagram shows the lines of magnetic
force between two north magnetic poles.
At which point is the magnetic field
strength greatest?
(A) A
(B) B (C) C (D) D
NORTH
SOUTH
A beam of electrons is directed into the electric
field between two oppositely charged parallel
plates. The force exerted on the electrons by the
magnetic field is directed
(A) into the screen
(B) out of the screen
(C) toward the top or bottom of the screen
(D) no change in direction
Magnetic fields are produced by particles
that are
(A) moving and charged
(B) moving and neutral
(C) stationary and charged
(D) stationary and neutral
Magnets exert ____ on each other.
A. Charges
B. Connectivity
C. Forces
D. Radiation
If you break a magnet in half twice, you
will have...
A. 2 complete magnets with a North and
South Pole
B. 2 magnets with 1 north pole and 1
south pole
C. 4 magnets with 2 north poles and 2
south poles
D. 4 complete magnets each with a
North and South Pole
A magnetic field is...
A. The space around the magnet in which
a magnetic force is exerted.
B. A producer of magnetic forces.
C. A picture of many magnets in a field.
D. The iron that you place on top of a
magnet.
E. A bad Kevin Costner movie.
Clusters of aligned atoms are called...
A. Magnetism
B. Magnetic Domains
C. Magnetic Fields
D. Magnetic Poles
A strong electromagnet is...
A. A current-carrying coil of wire with
many loops
B. A current-carrying coil of wire
C. A wire with many loops
D. A coil of wire
If a single looped, current-carrying wire is
bent into another loop, the concentration of
the magnetic field lines inside the double
loop is...
A. Half as much as in the single loop
B. Four times as much as in the single loop
C. The same as in the single loop
D. Twice as much as in the single loop
The force is greatest on a charged
particle when the particle moves in a
direction...
A. perpendicular to the magnetic field
lines.
B. parallel to the magnetic field lines.
C. at a 45 degree angle.
D. in a circle.
If the direction of current in the wire is
reversed, the deflecting force acts in the...
A. Same direction
B. Opposite direction
C. Downward direction
D. Upward direction
What does placing a piece of iron into a
current-carrying coil create?
A. A smaller magnetic field.
B. A breaking of the coil.
C. An electromagnet.
D. A magnetic field.
What is a device used for changing the
potential difference (voltage) of
alternating currents?
A. An ammeter.
B. A voltmeter.
C. A direct current.
D. A transformer.
E. Not possible
What is a device used for changing the
current (amperage) of alternating
currents?
A. An ammeter.
B. A voltmeter.
C. A direct current.
D. A transformer.
E. Not possible
What is a device used for changing the
power (watts) of alternating currents?
A. An ammeter.
B. A voltmeter.
C. A direct current.
D. A transformer.
E. Not possible
A typical solenoid that has current
flowing through it behaves like…
a. wire
b. a bar magnet
c. electricity
d. transformer
In a turbine, the blades spin the magnet
rapidly, rotating the magnet inside the
coil of the generator producing a(n)
A. voltage
B. resistance
C. electric current
Which metal does NOT have a natural
magnetism?
A. Cobalt
B. Nickel
C. Copper
D. Iron
What is a machine that produces
electrical current by rotating a coil within
a stationary magnetic field?
A. Generator
B. Transformer
C. Light bulb
What is the AVERAGE period time
between when Earth’s poles have
switched in the past?
A. 10,000 years
B. 100,000 years
C. 200,000 years
D. 750,000 years
Charged particles from outer space are
deflected by Earth’s _____.
A. magnetic field
B. atmosphere
C. ozone
D. lithosphere
E. greenhouse gas
Magnetism is related to ________.
A. biology
B. chemistry
C. electricity
D. geology
E. Psychology
F. None of these
Sunspots on the sun’s surface are places
where:
A. The sun has been burnt
B. Gravity is greater
C. Magnetism is less
D. Magnetism is greater
How is a magnetic field produced?
A. By polar attraction
B. By the motion of electric charge.
C. By the nature of a magnetic field
Mars no longer has a magnetic field
because
a. The core has solidified
b. The magnetic field has reversed
c. Because Mars is spinning faster
d. It is a permanent magnet
According to Faraday’s law the induce
voltage in a coil is ______ to the product
of number of loops
A. Not related
B. Inversely proportional
C. Proportional
A changing magnetic field induces a/an
_____
A. Magnetic field
B. Electric field
C. Force field
D. Circuit breakers
For a transformer:
The primary voltage is 120 volts and
the primary amperage is 5 amps, the
power is _____ watts.
For a transformer:
If the primary voltage is 120 volts
and the primary amperage is 5 amps,
the power is _____ watts in the
secondary.
For a transformer:
If the primary voltage is 120 volts
and the primary amperage is 5 amps
with 1:20 ratio, what is the voltage in
the secondary?
For a transformer:
If the primary voltage is 120 volts
and the primary amperage is 5 amps
with 1:20 ratio, what is the amperage
in the secondary?
For a transformer:
The secondary voltage is 120 volts
and the secondary amperage is 5
amps, the power is _____ watts.
For a transformer:
If the secondary voltage is 120 volts
and the secondary amperage is 5
amps, the power is _____ watts in the
primary.
For a transformer:
If the secondary voltage is 120 volts
and the secondary amperage is 5
amps with 1:20 ratio, what is the
voltage in the primary?
For a transformer:
If the secondary voltage is 120 volts
and the secondary amperage is 5
amps with 1:20 ratio, what is the
amperage in the primary?
For a transformer:
The primary has a voltage of 6000 volts and
amperage is 200 amps.
What is the power in the primary?
38
For a transformer:
The primary has a voltage of 6000 volts and
amperage is 200 amps.
The secondary has a voltage of 480,000 volts and
amperage is 2.4 amps.
What is the power in the secondary?
39
For a transformer:
The primary has a voltage of 6000 volts and
amperage is 200 amps.
The secondary has a voltage of 480,000 volts and
amperage is 2.4 amps.
What is the efficiency of the transformer?
40