PHYSICS 2 FINAL REVIEW EXAM
LATEST UPDATE 2026
Now consider what happens when a switch in the circuit is opened.
What happens to the brightness of bulb A?
It gets dimmer
It gets brighter
There is no change - ANSWER --It gets dimmer
A wire loop moves at constant velocity without rotation through a constant magnetic field. The
induced current in the loop will be
counterclockwise
clockwise
zero
We need to know the orientation of the loop relative to the magnetic field. - ANSWER --
Zero because it is moving at a constant speed
Two loops of wire are moving in the vicinity of a very long straight wire carrying a steady current
Find the direction of the induced current in loop C.
,clockwise
alternating (ac)
counterclockwise
zero - ANSWER --zero, facing the same direction as induced current
Two loops of wire are moving in the vicinity of a very long straight wire carrying a steady current
Find the direction of the induced current in loop D.
clockwise
alternating (ac)
counterclockwise
zero - ANSWER --Clockwise
A square loop moves to the right from an area where B⃗ =0, completely through a region
containing a uniform magnetic field directed into the figure (Figure 1), and then out to B=0 after
point L. A current is induced in the loop
only as it passes line J
as it passes line J or line L
only as it passes line L
only as it passes line K
as it passes all three lines. - ANSWER --as it passes line J or line L
A bar magnet is held above the floor and dropped (Figure 1). In case (a), the magnet falls
through a wire loop. In case (b), there is nothing between the magnet and the floor.
,If there is induced current, wouldnt that cost energy? Where would that energy come from in
case (a)?
There is less kinetic energy in case (a) than in case (b)
Induced current doesn't need energy
Energy conservation is violated in case (a)
There is more gravitational potential energy in case (a) than in case (b). - ANSWER --There
is less kinetic energy in case (a) than in case (b)
A nonconducting plastic hoop is held in a magnetic field that points out of the figure (Figure 1).
As the strength of the field increases,
an induced emf will be produced but no current
an induced emf will be produced that causes a counterclockwise current
an induced emf will be produced that causes a clockwise current
no induced emf will be produced. - ANSWER --an induced emf will be produced but no
current
A long straight wire carries a current I as shown in (Figure 1). A small loop of wire rests in the
plane of the figure.
Which of the following will not induce a current in the loop?
Increasing the current in the straight wire
Moving the loop in a direction parallel to the wire
Rotating the loop so that it becomes perpendicular to the plane of the figure
Moving the loop farther from the wire without rotating it
, Moving the loop farther from the wire while rotating it. - ANSWER --Moving the loop in a
direction parallel to the wire
Two separate but nearby coils are mounted along the same axis. A power supply controls the
flow of current in the first coil, and thus the magnetic field it produces. The second coil is
connected only to an ammeter. The ammeter will indicate that a current is flowing in the second
coil.
only when the current in the first coil changes
only if the second coil is connected to the power supply by rewiring it to be in series with the
first coil
only when a steady current flows in the first coil
whenever a current flows in the first coil. - ANSWER --only when the current in the first
coil changes
When a generator is used to produce electric current, the resulting electric energy originates
from which source?
The resistance of the generator's coil
Empty space
Whatever rotates the generator's axle
Back emf
The generator's magnetic field. - ANSWER --Whatever rotates the generator's axle
Which of the following will not increase a generator's voltage output?
Rotating the generator faster
Increasing the area of the coil
LATEST UPDATE 2026
Now consider what happens when a switch in the circuit is opened.
What happens to the brightness of bulb A?
It gets dimmer
It gets brighter
There is no change - ANSWER --It gets dimmer
A wire loop moves at constant velocity without rotation through a constant magnetic field. The
induced current in the loop will be
counterclockwise
clockwise
zero
We need to know the orientation of the loop relative to the magnetic field. - ANSWER --
Zero because it is moving at a constant speed
Two loops of wire are moving in the vicinity of a very long straight wire carrying a steady current
Find the direction of the induced current in loop C.
,clockwise
alternating (ac)
counterclockwise
zero - ANSWER --zero, facing the same direction as induced current
Two loops of wire are moving in the vicinity of a very long straight wire carrying a steady current
Find the direction of the induced current in loop D.
clockwise
alternating (ac)
counterclockwise
zero - ANSWER --Clockwise
A square loop moves to the right from an area where B⃗ =0, completely through a region
containing a uniform magnetic field directed into the figure (Figure 1), and then out to B=0 after
point L. A current is induced in the loop
only as it passes line J
as it passes line J or line L
only as it passes line L
only as it passes line K
as it passes all three lines. - ANSWER --as it passes line J or line L
A bar magnet is held above the floor and dropped (Figure 1). In case (a), the magnet falls
through a wire loop. In case (b), there is nothing between the magnet and the floor.
,If there is induced current, wouldnt that cost energy? Where would that energy come from in
case (a)?
There is less kinetic energy in case (a) than in case (b)
Induced current doesn't need energy
Energy conservation is violated in case (a)
There is more gravitational potential energy in case (a) than in case (b). - ANSWER --There
is less kinetic energy in case (a) than in case (b)
A nonconducting plastic hoop is held in a magnetic field that points out of the figure (Figure 1).
As the strength of the field increases,
an induced emf will be produced but no current
an induced emf will be produced that causes a counterclockwise current
an induced emf will be produced that causes a clockwise current
no induced emf will be produced. - ANSWER --an induced emf will be produced but no
current
A long straight wire carries a current I as shown in (Figure 1). A small loop of wire rests in the
plane of the figure.
Which of the following will not induce a current in the loop?
Increasing the current in the straight wire
Moving the loop in a direction parallel to the wire
Rotating the loop so that it becomes perpendicular to the plane of the figure
Moving the loop farther from the wire without rotating it
, Moving the loop farther from the wire while rotating it. - ANSWER --Moving the loop in a
direction parallel to the wire
Two separate but nearby coils are mounted along the same axis. A power supply controls the
flow of current in the first coil, and thus the magnetic field it produces. The second coil is
connected only to an ammeter. The ammeter will indicate that a current is flowing in the second
coil.
only when the current in the first coil changes
only if the second coil is connected to the power supply by rewiring it to be in series with the
first coil
only when a steady current flows in the first coil
whenever a current flows in the first coil. - ANSWER --only when the current in the first
coil changes
When a generator is used to produce electric current, the resulting electric energy originates
from which source?
The resistance of the generator's coil
Empty space
Whatever rotates the generator's axle
Back emf
The generator's magnetic field. - ANSWER --Whatever rotates the generator's axle
Which of the following will not increase a generator's voltage output?
Rotating the generator faster
Increasing the area of the coil
