PHYS112 final - rio salado Exam ( Updated
2025 ) 1-100 Complete Questions &
Answers (Solved) 100% Correct
When an iron bar is moved through a uniform magnetic
field, what happens to the charge carriers within the bar?
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?
It increases the charge separation
How is flux defined in the context of magnetic fields?
,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?
The induced current flows in the opposite direction of the
changing flux
What does Faraday's Law state regarding the relationship
between induced EMF and the rate change of flux
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?
It is opposite to the change in flux
In the context of Faraday's law, what does the negative
sign in the equation signify?
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?
Example work: BLvcos() = (0.30T)(0.32m)(23m/s) = 2,208
= 2.2V
, What is the fundamental difference between motors and
generators?
Motors convert electric energy into work, while
generators convert work into electric energy.
According to Faraday's law, what induces an EMF in a
generator?
Change in the angle between the loop and the magnetic
field
According to. Faraday's law, what induces an EMF in a
motor?
Change in number of loops
How does Lenz's law effect the operation of a generator?
It induces and EMF that opposes the original current
through the loop
How does Lenz's law effect the operation of a motor?
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?
To change the voltage in a circuit
2025 ) 1-100 Complete Questions &
Answers (Solved) 100% Correct
When an iron bar is moved through a uniform magnetic
field, what happens to the charge carriers within the bar?
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?
It increases the charge separation
How is flux defined in the context of magnetic fields?
,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?
The induced current flows in the opposite direction of the
changing flux
What does Faraday's Law state regarding the relationship
between induced EMF and the rate change of flux
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?
It is opposite to the change in flux
In the context of Faraday's law, what does the negative
sign in the equation signify?
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?
Example work: BLvcos() = (0.30T)(0.32m)(23m/s) = 2,208
= 2.2V
, What is the fundamental difference between motors and
generators?
Motors convert electric energy into work, while
generators convert work into electric energy.
According to Faraday's law, what induces an EMF in a
generator?
Change in the angle between the loop and the magnetic
field
According to. Faraday's law, what induces an EMF in a
motor?
Change in number of loops
How does Lenz's law effect the operation of a generator?
It induces and EMF that opposes the original current
through the loop
How does Lenz's law effect the operation of a motor?
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?
To change the voltage in a circuit
