PHY 112 MIDTERM EXAM QUESTIONS
WITH COMPLETE SOLUTIONS 2025
Which of the following particles carries the positive type of charge? - ANSWER-Proton
Two charged particles, each with a charge of +8.0 μC are at some position near each
other. What is the distance between the particles if the static electric force between
them is 5.0 N? - ANSWER-0.34 m
Two charged particles each with a net charge of -q are a distance r apart. The electric
force F is measured. The distance between the particles then doubles to 2r, and the
amount of charge on BOTH charges doubles to -2q. Relative to the original force, what
is the new electric force? - ANSWER-F
An electroscope is a device that has small gold foil strips suspended from a metal rod. If
the electroscope is negatively charged, the foil strips will repel and separate from each
other (see below). If you bring a negatively charged rod near the top of a negatively
charged electroscope, the foil strips will - ANSWER-Separate further.
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? - ANSWER-The particles will repel. As they get further apart, the repelling
force will decrease.
Which of the following statements regarding charge is most accurate? - ANSWER-All of
the above are accurate
The property of matter that is responsible for static electric effects is - ANSWER-Charge
Two positively charged particles experience a static electric force of F. One of the
particles is replaced with a new charged particle that has three times more charge than
the original. The new static electric force will be - ANSWER-3F
Which of the following statements concerning the structure of an atom is accurate? -
ANSWER-Neutrally charged atoms contain equal amounts of protons and electron
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? - ANSWER-They apply the same force on each other
, Which of the following is an accurate example of charging by induction? - ANSWER-A
student brings a charged rod near a block of metal. The student taps the block of metal
with a hand and then removes the charged rod.
Which of the following statements regarding charge is most accurate? - ANSWER-
Objects with like charges repel, while objects with opposite charges attract.
Which of the following processes will NOT result in a change in net charge on an
object? - ANSWER-Polarization
Three charged particles are held in place. Particle A has a net charge of +2 μC and is at
(0, 0) m. Particle B has a net charge of -4 μC and is placed a (0.5, 0) m. Particle C has
a net charge of -4 μC and is at (0, 0.5) m. What is the magnitude of the net force on
particle A? - ANSWER-0.41 N
Which of the following statements concerning charge is most accurate? - ANSWER-The
total charge present in the system and surroundings is constant in any process.
Two neutral metal blocks are in physical contact side-by-side. Block A is on the left, and
block B is on the right. A positively charged rod is near the left side of block A (see
below). With the positive rod still present, the blocks separate. As a result, block B will
have a net charge that is - ANSWER-Positive
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?
- ANSWER-The balloon caused the ceiling to polarize, which created a net attracting
force between the polarized ceiling and the balloon.
What is the net charge on an object that has gained 8 x 1013 electrons? - ANSWER--
1.3 x 10-5 C
Not -8 x 10^13 C
Charged particles A and B experience a static electric force of F. If the distance
between the charge particles triples, then the static electric force becomes - ANSWER-
1/9 F
Lesson QUIZ 3: - ANSWER-
Based on the equipotentials shown in the example below, order the magnitude of the
potentials at points A, B, and C (from greatest to least). - ANSWER-A> B> C
A negatively charged particle moves through various electric fields. Which of the
following correctly indicates whether the negatively charged particle gained or lost
energy in each of the following examples? - ANSWER-Example 1: Gained Energy
Example 2: Lost energy
WITH COMPLETE SOLUTIONS 2025
Which of the following particles carries the positive type of charge? - ANSWER-Proton
Two charged particles, each with a charge of +8.0 μC are at some position near each
other. What is the distance between the particles if the static electric force between
them is 5.0 N? - ANSWER-0.34 m
Two charged particles each with a net charge of -q are a distance r apart. The electric
force F is measured. The distance between the particles then doubles to 2r, and the
amount of charge on BOTH charges doubles to -2q. Relative to the original force, what
is the new electric force? - ANSWER-F
An electroscope is a device that has small gold foil strips suspended from a metal rod. If
the electroscope is negatively charged, the foil strips will repel and separate from each
other (see below). If you bring a negatively charged rod near the top of a negatively
charged electroscope, the foil strips will - ANSWER-Separate further.
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? - ANSWER-The particles will repel. As they get further apart, the repelling
force will decrease.
Which of the following statements regarding charge is most accurate? - ANSWER-All of
the above are accurate
The property of matter that is responsible for static electric effects is - ANSWER-Charge
Two positively charged particles experience a static electric force of F. One of the
particles is replaced with a new charged particle that has three times more charge than
the original. The new static electric force will be - ANSWER-3F
Which of the following statements concerning the structure of an atom is accurate? -
ANSWER-Neutrally charged atoms contain equal amounts of protons and electron
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? - ANSWER-They apply the same force on each other
, Which of the following is an accurate example of charging by induction? - ANSWER-A
student brings a charged rod near a block of metal. The student taps the block of metal
with a hand and then removes the charged rod.
Which of the following statements regarding charge is most accurate? - ANSWER-
Objects with like charges repel, while objects with opposite charges attract.
Which of the following processes will NOT result in a change in net charge on an
object? - ANSWER-Polarization
Three charged particles are held in place. Particle A has a net charge of +2 μC and is at
(0, 0) m. Particle B has a net charge of -4 μC and is placed a (0.5, 0) m. Particle C has
a net charge of -4 μC and is at (0, 0.5) m. What is the magnitude of the net force on
particle A? - ANSWER-0.41 N
Which of the following statements concerning charge is most accurate? - ANSWER-The
total charge present in the system and surroundings is constant in any process.
Two neutral metal blocks are in physical contact side-by-side. Block A is on the left, and
block B is on the right. A positively charged rod is near the left side of block A (see
below). With the positive rod still present, the blocks separate. As a result, block B will
have a net charge that is - ANSWER-Positive
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?
- ANSWER-The balloon caused the ceiling to polarize, which created a net attracting
force between the polarized ceiling and the balloon.
What is the net charge on an object that has gained 8 x 1013 electrons? - ANSWER--
1.3 x 10-5 C
Not -8 x 10^13 C
Charged particles A and B experience a static electric force of F. If the distance
between the charge particles triples, then the static electric force becomes - ANSWER-
1/9 F
Lesson QUIZ 3: - ANSWER-
Based on the equipotentials shown in the example below, order the magnitude of the
potentials at points A, B, and C (from greatest to least). - ANSWER-A> B> C
A negatively charged particle moves through various electric fields. Which of the
following correctly indicates whether the negatively charged particle gained or lost
energy in each of the following examples? - ANSWER-Example 1: Gained Energy
Example 2: Lost energy
