WorksheetsAP2 Magnetism Review
Total questions: 60
Worksheet time: 52mins
Magnetism is generated inside an atom due to spinning _________
protons.
electrons.
neutrons.
elements.
If a glass plate is placed over a magnet and iron filings are sprinkled over the glass, a pattern will be visible. What does this pattern indicate?
The magnetic field
The electrostatic field
The piezoelectric effect
The chemical reaction of the magnet and the filings
How can a wire become magnetic?
point it north
add a resistor
heat it up
run a current through it
F = qvB If the speed and charge double, what happens to the magnetic force?
halves
remains the same
doubles
quadruples
F = BIL If the current and magnetic field are doubled, the magnetic force on the wire
halves
remains the same
doubles
quadruples
What are the microscopic regions of atoms with a commonly aligned magnetic field called?
micromagnets
amps
magnetic zones
magnetic domains
What experiences a magnetic force in a magnetic field?
a wire
a length of wire
a electrical current in wire
What experiences a magnetic force in a magnetic field?
a charge
a moving object
a moving charged object
one N and one S
both N
both S
each piece still has a N and S
How could you make a stronger electromagnet?
more coils of wire
add an iron core
more current in the wire
all three
What does the direction of the pointing fingers mean in this picture?
the direction of the voltage
the rotation of the wire
the direction of the magnetic field
the direction of the current
What is this?
electromagnet
permanent magnet
motor
generator
Which direction do the arrows point when representing the magnetic field around a magnet?
into N
out of S
into S
out of N
Which drawing is correct?
1
2
3
4
The diagram shows a coil of wire connected to a battery. The N-pole of this coil is closest to
A
B
C
D
Which particle would produce a magnetic field?
A stationary charged particle
A neutral particle moving in a straight line
A moving charged particle
A neutral particle moving in a circle
In the diagram, when the conventional current is flowing in the direction indicated by the arrow, the direction of the force in the wire will be
toward the south pole
toward the north pole
into this screen
out of this screen
An electron in a magnetic field travels at constant speed in the circular path represented in the diagram. Which arrow represents the direction of the net force acting on the electron when the electron is at position A?
In the diagram, electrons flowing through the wire as shown will cause the wire to move toward the
top of this screen
bottom of this screen
south pole
north pole
The diagram represents an electromagnet. The arrows indicate the direction of the magnetic field. What is the polarity of K?
positive
north
negative
south
A beam of electrons is directed from point A toward point B between the poles of the magnet. As the beam passes between J and K, it will be deflected
out of this screen
toward J
toward K
into this screen
If the voltage of the power source is increased, the magnitude of the flux density between the poles of the magnet will
decrease
increase
remain the same
An electron traveling at a speed (V) in the plane of this screen enters a uniform magnetic field. Which diagram best represents the condition under which the electron will experience the greatest magnetic force as it enters the magnetic field?
A compass is located at point X near a bar magnet as shown in the diagram. Which diagram shows the proper direction of the compass needle?
When two ring magnets are placed on a pencil, magnet A remains suspended above magnet B, as shown. Which statement describes the gravitational force and the magnetic force acting on magnet A due to magnet B?
The gravitational force is attractive and the magnetic force is repulsive.
The gravitational force is repulsive and the magnetic force is attractive.
Both the gravitational force and the magnetic force are attractive.
Both the gravitational force and the magnetic force are repulsive
The diagram represents the magnetic field around point P, at the center of a current carrying wire. What is the direction of conventional current in the wire?
from A to B
from B to A
From P into the screen
From P out of the screen
Electrons are flowing in a conductor as shown in the diagram. What is the direction of the magnetic field at point P?
toward the top of this screen
toward the bottom of this screen
into this screen
out of this screen
Each diagram represents a cross section of a long, straight, current-carrying wire with conventional current into this screen. Which diagram best represents the magnetic field near the wire?
The diagram shows an electromagnet made from a nail, a coil of insulated wire, and a battery. The south pole of the electromagnet is located closest to point
A
B
C
D
The diagram shows an electron current in a wire loop. What is the direction of the magnetic field at the center of the loop?
into this screen
out of this screen
clockwise
counterclockwise
The diagram shows a conductor carrying a current in which the electron flow is from left to right. The conductor is located in a magnetic field which is directed into this screen. The direction of the magnetic force on the conductor will be
into this screen
out of this screen
toward the top of this screen
toward the bottom to this screen
Each of the figures shows the path of a charged particle moving in the plane of the screen in a magnetic field that is perpendicular to the screen. If mass, speed and charge are the same, in which case does the field have the greatest magnitude?
An object with charge -q is in motion near a wire that has a current I to the right. At the instant shown in the figure, the object is traveling to the right with speed v. Both the wire and the motion of the object are in the plane of the page. Which of the following statements is true about the force on the object due to the current I at the instant shown?
The force is directed toward the top of this screen.
The force is directed toward the bottom of this screen.
The force is directed toward the right.
There is no force on the object due to the current.
Four infinitely long wires are arranged as shown in the accompanying figure end-on-view. All four wires are perpendicular to the plane of the screen and have the same magnitude of current I. The conventional current in the wire in the upper right hand corner is directed into the plane of the screen. The other conventional currents are out of the plane of the screen. Point P is a distance a from all four wires. What is the total magnetic field at point P?
zero
A loop of wire is connected to an ammeter, as shown, and held in place. The ammeter has a scale with zero in the middle and a needle that moves away from zero in either direction to measure the magnitude and direction of any current in the loop. A bar magnet is held above the center of the loop and released from rest. Which of the following best describes the action of the ammeter needle as the magnet falls through the loop?
The ammeter needle remains at zero.
The ammeter needle deflects in one direction as the magnet approaches, passes through, and moves away from the loop.
The ammeter needle deflects in one direction as the north end of the magnet approaches the loop, returns to zero when the center of the magnet is in the loop, and deflects in the same direction when the south end of the magnet is moving away from the loop.
The ammeter needle deflects in one direction as the north end of the magnet approaches the loop, returns to zero when the center of the magnet is in the loop, and deflects in the other direction when the south end of the magnet is moving away from the loop.
It's the product of the magnetic flux density and the area normal to the lines of flux.
Magnetic Flux Density
Magnetic Flux
Magnetic Flux Linkage
Magnetic Field
The SI unit of magnetic flux, causing the e.m.f. of one volt in a circuit of one turn when the flux is uniformly reduced to zero in one second.
Tesla
Tesla turns
Weber turns
Weber
The production of electric current by a changing magnetic field is called ____________________________________.
induced current
electromotive force
electromagnetic induction
internal resistance
A uniform 4.5 𝑇 magnetic field passes
perpendicularly through the plane of a wire loop
0.10 𝑚2 in area. What flux passes through the loop?
0.35 𝑇𝑚2
0.45 𝑇𝑚2
0.55 𝑇𝑚2
0.65 𝑇𝑚2
A uniform 4.5 𝑇 magnetic field passes through the
plane of a wire loop 0.10 𝑚2 in area. What flux
passes through the loop when the direction of the
4.5 𝑇 field is at a 30° angle to the normal of the loop
plane?
0.39 𝑇𝑚2
0.49 𝑇𝑚2
0.59 𝑇𝑚2
0.69 𝑇𝑚2
The figure below shows a magnetic field 𝐵
passing through a coil. Which of the following rank
the magnetic flux from a maximum to a minimum?
𝐴 > 𝐵 > 𝐶 > 𝐷
𝐴 > 𝐷 > 𝐶 > 𝐵
𝐴 = 𝐵 > 𝐷 > 𝐶
𝐶 > 𝐷 > 𝐴 > 𝐵
A ring is originally oriented 30-deg from the magnetic field. Which of the following would increase the flux?
increasing the field
reversing the direction of the field
increasing 30-deg to 90-deg
decreasing 30-deg to 0-deg
A field of constant B = 0.5 T is enclosed by a ring with radius 2m. Which of the following is true?
Flux is 2π Webers and has counterclockwise current
Flux is 2π Webers and has no current
Flux is 0 Webers and has clockwise current
Flux is 0 Webers and has no current
If the magnetic field were increased from B = 0.5 T to 1.0T, the induced field in the loop would be directed _______
clockwise
counterclockwise
into the page
out of the page
If the magnetic field were increased from B = 0.5 mT to 1.0mT, the induced current in the loop would be directed _______
clockwise
counterclockwise
into the page
out of the page
A moveable rod makes contact along two rails with a lightbulb attached. As the rod is moved to the right, the magnetic flux _________.
increases
decreases
stays the same
A moveable rod makes contact along two rails with a lightbulb attached. As the rod is moved to the right, a magnetic field is induced _________.
counterclockwise
clockwise
into the page
out of the page
A moveable rod makes contact along two rails with a lightbulb attached. As the rod is moved to the right, a current is induced _________.
counterclockwise
clockwise
into the page
out of the page
In this picture, a bar slides to the right. The flux is _______ and field is induced ________.
increasing, out of the page
increasing, into the page
decreasing, out of the page
decreasing, into the page
