1|Page
RIO SALADO Physics 112 Final Exam Newest
2025/2026 With Complete 100 Questions And
Correct Answers |Already Graded A+||Brand New
Version!|
When an iron bar is moved through a uniform magnetic
field, what happens to the charge carriers within the
bar? - ....ANSWER.....✓✓Negative charge carriers move
relatively freely while the positive charge carriers do
not
How does the induced EMF in a conductor moving
through a magnetic field affect charge distribution? -
....ANSWER.....✓✓It increases the charge separation
How is flux defined in the context of magnetic fields? -
....ANSWER.....✓✓The measure of the number of
magnetic field lines passing through a given area
What doe Lenz's Law state regarding the direction of
induced current? - ....ANSWER.....✓✓The induced current
flows in the opposite direction of the changing flux
,2|Page
What does Faraday's Law state regarding the
relationship between induced EMF and the rate change
of flux - ....ANSWER.....✓✓The induced EMF is directly
proportional to the rate of change of flux
According to Faraday's law, what happens to the
direction of the induced EMF with respect to the change
in flux? - ....ANSWER.....✓✓It is opposite to the change in
flux
In the context of Faraday's law, what does the negative
sign in the equation signify? - ....ANSWER.....✓✓It
signifies the direction of the induced EMF
What is the magnitude of the induced EMF across a
metal bar (32cm) moved through a 0.30 T magnetic field
and 23m/s? - ....ANSWER.....✓✓Example work: BLvcos()
= (0.30T)(0.32m)(23m/s) = 2,208 = 2.2V
What is the fundamental difference between motors
and generators? - ....ANSWER.....✓✓Motors convert
electric energy into work, while generators convert
work into electric energy.
, 3|Page
According to Faraday's law, what induces an EMF in a
generator? - ....ANSWER.....✓✓Change in the angle
between the loop and the magnetic field
According to. Faraday's law, what induces an EMF in a
motor? - ....ANSWER.....✓✓Change in number of loops
How does Lenz's law effect the operation of a
generator? - ....ANSWER.....✓✓It induces and EMF that
opposes the original current through the loop
How does Lenz's law effect the operation of a motor? -
....ANSWER.....✓✓the EMF, opposes any change, so that
the input EMF that powers the motor will be opposed by
the motor's self-generated EMF, called the back EMF of
the motor.
What is the purpose of a transformer in an electrical
circuit? - ....ANSWER.....✓✓To change the voltage in a
circuit
What did Maxwell's electromagnetic theory
demonstrate? - ....ANSWER.....✓✓The wave nature of
electricity and magnetism
RIO SALADO Physics 112 Final Exam Newest
2025/2026 With Complete 100 Questions And
Correct Answers |Already Graded A+||Brand New
Version!|
When an iron bar is moved through a uniform magnetic
field, what happens to the charge carriers within the
bar? - ....ANSWER.....✓✓Negative charge carriers move
relatively freely while the positive charge carriers do
not
How does the induced EMF in a conductor moving
through a magnetic field affect charge distribution? -
....ANSWER.....✓✓It increases the charge separation
How is flux defined in the context of magnetic fields? -
....ANSWER.....✓✓The measure of the number of
magnetic field lines passing through a given area
What doe Lenz's Law state regarding the direction of
induced current? - ....ANSWER.....✓✓The induced current
flows in the opposite direction of the changing flux
,2|Page
What does Faraday's Law state regarding the
relationship between induced EMF and the rate change
of flux - ....ANSWER.....✓✓The induced EMF is directly
proportional to the rate of change of flux
According to Faraday's law, what happens to the
direction of the induced EMF with respect to the change
in flux? - ....ANSWER.....✓✓It is opposite to the change in
flux
In the context of Faraday's law, what does the negative
sign in the equation signify? - ....ANSWER.....✓✓It
signifies the direction of the induced EMF
What is the magnitude of the induced EMF across a
metal bar (32cm) moved through a 0.30 T magnetic field
and 23m/s? - ....ANSWER.....✓✓Example work: BLvcos()
= (0.30T)(0.32m)(23m/s) = 2,208 = 2.2V
What is the fundamental difference between motors
and generators? - ....ANSWER.....✓✓Motors convert
electric energy into work, while generators convert
work into electric energy.
, 3|Page
According to Faraday's law, what induces an EMF in a
generator? - ....ANSWER.....✓✓Change in the angle
between the loop and the magnetic field
According to. Faraday's law, what induces an EMF in a
motor? - ....ANSWER.....✓✓Change in number of loops
How does Lenz's law effect the operation of a
generator? - ....ANSWER.....✓✓It induces and EMF that
opposes the original current through the loop
How does Lenz's law effect the operation of a motor? -
....ANSWER.....✓✓the EMF, opposes any change, so that
the input EMF that powers the motor will be opposed by
the motor's self-generated EMF, called the back EMF of
the motor.
What is the purpose of a transformer in an electrical
circuit? - ....ANSWER.....✓✓To change the voltage in a
circuit
What did Maxwell's electromagnetic theory
demonstrate? - ....ANSWER.....✓✓The wave nature of
electricity and magnetism
