Rio Salado PHY 112 Final Review Exam with
Answers
Question 1
In the context of Faraday's law, what does the negative sign in the equation signify?
A) It indicates a positive change in flux
B) It indicates a negative change in flux
C) It signifies the direction of the induced EMF
D) It signifies the direction of the magnetic field
Correct Answer
C) It signifies the direction of the induced EMF
Question 2
What is the purpose of a transformer in an electrical circuit?
A) To convert electric energy into work
B) To change the direction of current flow
C) To change the voltage in a circuit
D) To increase the resistance of the circuit
Correct Answer
C) To change the voltage in a circuit
Question 3
According to Faraday's law, what induces an EMF in a generator?
A) Change in the magnetic field strength
B) Change in the loop area
C) Change in the angle between the loop and the magnetic field
D) Change in the number of loops
Correct Answer
C) Change in the angle between the loop and the magnetic field
Page 1 of 10
, Question 4
What does Ampere's circuit law describe?
A) The behavior of electric field lines
B) The behavior of magnetic field lines
C) How magnetic fields are created by moving charges or changing electric fields
D) The relationship between electric and magnetic flux
Correct Answer
C) How magnetic fields are created by moving charges or changing electric fields
Question 5
How are electric and magnetic waves related according to Maxwell's equations?
A) They are always in phase with each other
B) They are always out of phase with each other
C) They are unrelated phenomena
D) They occur together and travel perpendicular to each other
Correct Answer
D) They occur together and travel perpendicular to each other
Question 6
What is the relationship between the speed of an electromagnetic wave and the
amplitude of the electric and magnetic fields?
A) Speed is directly proportional to the amplitude of the electric field
B) Speed is inversely proportional to the amplitude of the electric field
C) Speed is directly proportional to the amplitude of the magnetic field
D) Speed is inversely proportional to the amplitude of the magnetic field
Correct Answer
A) Speed is directly proportional to the amplitude of the electric field
Page 2 of 10
Answers
Question 1
In the context of Faraday's law, what does the negative sign in the equation signify?
A) It indicates a positive change in flux
B) It indicates a negative change in flux
C) It signifies the direction of the induced EMF
D) It signifies the direction of the magnetic field
Correct Answer
C) It signifies the direction of the induced EMF
Question 2
What is the purpose of a transformer in an electrical circuit?
A) To convert electric energy into work
B) To change the direction of current flow
C) To change the voltage in a circuit
D) To increase the resistance of the circuit
Correct Answer
C) To change the voltage in a circuit
Question 3
According to Faraday's law, what induces an EMF in a generator?
A) Change in the magnetic field strength
B) Change in the loop area
C) Change in the angle between the loop and the magnetic field
D) Change in the number of loops
Correct Answer
C) Change in the angle between the loop and the magnetic field
Page 1 of 10
, Question 4
What does Ampere's circuit law describe?
A) The behavior of electric field lines
B) The behavior of magnetic field lines
C) How magnetic fields are created by moving charges or changing electric fields
D) The relationship between electric and magnetic flux
Correct Answer
C) How magnetic fields are created by moving charges or changing electric fields
Question 5
How are electric and magnetic waves related according to Maxwell's equations?
A) They are always in phase with each other
B) They are always out of phase with each other
C) They are unrelated phenomena
D) They occur together and travel perpendicular to each other
Correct Answer
D) They occur together and travel perpendicular to each other
Question 6
What is the relationship between the speed of an electromagnetic wave and the
amplitude of the electric and magnetic fields?
A) Speed is directly proportional to the amplitude of the electric field
B) Speed is inversely proportional to the amplitude of the electric field
C) Speed is directly proportional to the amplitude of the magnetic field
D) Speed is inversely proportional to the amplitude of the magnetic field
Correct Answer
A) Speed is directly proportional to the amplitude of the electric field
Page 2 of 10
