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RIO SALADO PHYSICS 112 MIDTERM EXAM
QUESTIONS AND ANSWERS (100%
VERIFIED) |AGRADE 2026
Charge is best defined as ______.
A. a fundamental property of matter.
B. the property that is responsible for electrical effects.
C. both of the above. - ✓✓ ANS- C. both of the above.
Electrical fields are created by _____.
A. the presence of charge.
B. the movement of charge.
C. the presence of mass.
D. more than one of the above - ✓✓ ANS- A. the presence of charge.
Electric fields are directed __________.
A. towards positively charged sources.
B. towards negatively charged sources.
C. in concentric circles around the source charge.
D. none of the above - ✓✓ ANS- B. towards negatively charged sources.
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Conventional current is based on the movement of _____.
A. positive charge.
B. negative charge.
C. any type of charge. - ✓✓ ANS- A. positive charge.
Charge movement is the result of _____.
A. electrical forces
B. interaction between electric fields
C. both of the above - ✓✓ ANS- C. both of the above
If moving charge is the source of all magnetism, how do permanent magnets work? - ✓✓ ANS-
The movement of charge at the atomic level create regions or domains where there are randomly
aligned N and S regions. When the ferromagnetic material becomes magnetized, the magnetic
direction of the domains are forced into alignment. Basically, the magnetic field of a permanent
magnet is still created by the movement of charge but it is movement at the atomic level.
How can you create a permanent magnet? How can you create an electromagnet? - ✓✓ ANS-
Place a ferromagnetic material in a magnetic field, and either heat and cool the material or tap the
material to force the domains into alignment with the external field.
Compare and contrast magnetic fields created by permanent magnets versus electromagnets. -
✓✓ ANS- Permanent magnets typically have field strengths from 5x10-3 T up to 2 T. The strength
of a permanent magnet is fixed (unless the magnet becomes demagnetized), and is always active.
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Electromagnets have variable field strengths that can be much, much greater than 2 T. The field
strengths depend on the amount of current used to create the magnet. Electromagnets can also
be turned on and off.
Which of the following is an example of an insulator?
A) A piece of paper
B) A block of wax
C) A block of glass
D) All of the above are examples of insulators - ✓✓ ANS- D) All of the above are examples of
insulators
The unit used to measure quantity of charge is the - ✓✓ ANS- Coulomb.
A positively charged plastic balloon filled with air will stick to a neutrally charged nonmetal
ceiling. Which of the following is the most likely explanation for this behavior?
A) Some of the charge on the balloon transferred to the ceiling through conduction.
B) The ceiling already had a net positive charge.
C) The ceiling already had a net negative charge.
D) The balloon caused the ceiling to polarize, which created a net attracting force between the
polarized ceiling and the balloon. - ✓✓ ANS- D) The balloon caused the ceiling to polarize, which
created a net attracting force between the polarized ceiling and the balloon.
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Two charged particles both have positive net charges. They are near each other and released from
rest. Which of the following statements best describes the interaction of the particles? - ✓✓
ANS- The particles will repel. As they get further apart, the repelling force will decrease.
Which of the following statements regarding charge is most accurate?
A) Charge is a fundamental property of matter.
B) Protons and electrons carry equal amounts of charge.
C) Two types of charge are possible.
D) All of the above are accurate. - ✓✓ ANS- D) All of the above are accurate.
The property of matter that is responsible for static electric effects is - ✓✓ ANS- charge.
Which of the following particles carries the positive type of charge? - ✓✓ ANS- protons
Particle A has a net charge of -5 μC. Particle B has a net charge of +10 μC. Which of the following
is the largest force? - ✓✓ ANS- They apply the same force on each other.
Which of the following statements concerning charge is most accurate? - ✓✓ ANS- The total
charge present in the system and surroundings is constant in any process.
Which of the following processes will NOT result in a change in net charge on an object?
A) Conduction
B) Induction
C) Polarization
D) All of the above processes will result in a change in net charge on an object. - ✓✓ ANS- C)
Polarization
RIO SALADO PHYSICS 112 MIDTERM EXAM
QUESTIONS AND ANSWERS (100%
VERIFIED) |AGRADE 2026
Charge is best defined as ______.
A. a fundamental property of matter.
B. the property that is responsible for electrical effects.
C. both of the above. - ✓✓ ANS- C. both of the above.
Electrical fields are created by _____.
A. the presence of charge.
B. the movement of charge.
C. the presence of mass.
D. more than one of the above - ✓✓ ANS- A. the presence of charge.
Electric fields are directed __________.
A. towards positively charged sources.
B. towards negatively charged sources.
C. in concentric circles around the source charge.
D. none of the above - ✓✓ ANS- B. towards negatively charged sources.
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Conventional current is based on the movement of _____.
A. positive charge.
B. negative charge.
C. any type of charge. - ✓✓ ANS- A. positive charge.
Charge movement is the result of _____.
A. electrical forces
B. interaction between electric fields
C. both of the above - ✓✓ ANS- C. both of the above
If moving charge is the source of all magnetism, how do permanent magnets work? - ✓✓ ANS-
The movement of charge at the atomic level create regions or domains where there are randomly
aligned N and S regions. When the ferromagnetic material becomes magnetized, the magnetic
direction of the domains are forced into alignment. Basically, the magnetic field of a permanent
magnet is still created by the movement of charge but it is movement at the atomic level.
How can you create a permanent magnet? How can you create an electromagnet? - ✓✓ ANS-
Place a ferromagnetic material in a magnetic field, and either heat and cool the material or tap the
material to force the domains into alignment with the external field.
Compare and contrast magnetic fields created by permanent magnets versus electromagnets. -
✓✓ ANS- Permanent magnets typically have field strengths from 5x10-3 T up to 2 T. The strength
of a permanent magnet is fixed (unless the magnet becomes demagnetized), and is always active.
, Page |3
Electromagnets have variable field strengths that can be much, much greater than 2 T. The field
strengths depend on the amount of current used to create the magnet. Electromagnets can also
be turned on and off.
Which of the following is an example of an insulator?
A) A piece of paper
B) A block of wax
C) A block of glass
D) All of the above are examples of insulators - ✓✓ ANS- D) All of the above are examples of
insulators
The unit used to measure quantity of charge is the - ✓✓ ANS- Coulomb.
A positively charged plastic balloon filled with air will stick to a neutrally charged nonmetal
ceiling. Which of the following is the most likely explanation for this behavior?
A) Some of the charge on the balloon transferred to the ceiling through conduction.
B) The ceiling already had a net positive charge.
C) The ceiling already had a net negative charge.
D) The balloon caused the ceiling to polarize, which created a net attracting force between the
polarized ceiling and the balloon. - ✓✓ ANS- D) The balloon caused the ceiling to polarize, which
created a net attracting force between the polarized ceiling and the balloon.
, Page |4
Two charged particles both have positive net charges. They are near each other and released from
rest. Which of the following statements best describes the interaction of the particles? - ✓✓
ANS- The particles will repel. As they get further apart, the repelling force will decrease.
Which of the following statements regarding charge is most accurate?
A) Charge is a fundamental property of matter.
B) Protons and electrons carry equal amounts of charge.
C) Two types of charge are possible.
D) All of the above are accurate. - ✓✓ ANS- D) All of the above are accurate.
The property of matter that is responsible for static electric effects is - ✓✓ ANS- charge.
Which of the following particles carries the positive type of charge? - ✓✓ ANS- protons
Particle A has a net charge of -5 μC. Particle B has a net charge of +10 μC. Which of the following
is the largest force? - ✓✓ ANS- They apply the same force on each other.
Which of the following statements concerning charge is most accurate? - ✓✓ ANS- The total
charge present in the system and surroundings is constant in any process.
Which of the following processes will NOT result in a change in net charge on an object?
A) Conduction
B) Induction
C) Polarization
D) All of the above processes will result in a change in net charge on an object. - ✓✓ ANS- C)
Polarization
