PHYSICS 112 FINAL EXAM RIO
SALADO 2025-2026 NEW GENERATION
EXAM QUESTIONS AND ANSWERS
[CORREECT APPROVED & VERIFIED]
which of the following statements regarding static electric charge is most
accurate
force is proportional to the inverse square distance between the charged particles
An object has a positive net charge. The most likely reason for the net charge is
that
electrons were transferred off the object
what is the net charge on an object that has gained 8x10^13 electrons
8x10 ^13 * 1.6 x10^-19
=-1.3 x10^-5
which of the following processes will not result in a change in net charge on an
object?
polarization
which of the following is an example of an insulation
a piece of paper
a block of wax
a block of glass
all of the above are examples
which of the following statements concerning charge is most accurate
the total charge present in the system and surroundings is constant in any process
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 ?
The particles will repel. As they get further apart, the repelling force will decrease
Particle A has a net charge of -5uC. Particle B has a net charge +10uC. Which of
the following is the largest force?
they apply the same force on each other
Which of the following statements concerning the structure of an atom is
accurate?
neutrally charged atoms contain equal amounts of protons and electrons
Two identical metal blocks are in contact side-by-side. A positively charged rod
moves near the left block. Which of the following most accurately shows the
resulting distribution of charge throughout the metal blocks?
When a positively charged rod moves near the left of the block, it attracts or pulls
negative charge of the block.
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?
,The ballon caused the ceiling to polarize, which created a net attracting force between
the polarized ceiling and the balloon
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. If you bring a negatively charged rod near the top of a
negatively charged electroscope, the foil strips will
separate further
Which of the following is an accurate example of charging by induction
a student brings a charged rod near a block of metal. The student taps the block of
metal with a hand and then removed the charged rod
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.
F
Two charged spheres are suspended from strings. The charged spheres repel
each other which statement correctly explains this behavior
both spheres have a negative net charge
both spheres have a positive net charge
both a and b are possible
Three charged particles are held in place. Particle A has a net charge of +2 uC
and is at (0,0)m. Particle B has a net charge of -4uC and is placed a (.5,0) m.
Particle C has a net charge of -4uC and is at(0,0.5) m. What is the magnitude of
the net force on particle A
9x10^9 (2x10^-6)(4x10^-6)/.5^2
=0.082944 +0.082944
=.16588
sqrt(.16588)
=0.41
Three charged particles are held in place. particle A has a net charge of +2 uC and
is at (0,0)m. Particle B has a net charge of +4 uC and is placed a (0.5,0)m. Particle
C has a net charge of -4uC and is placed at (0,0.5)m. What is the angle of direction
of the net force acting on particle A
135 degrees
Which of the following statements regarding charge is most accurate?
charge is a fundamental property of matter
proteins and electrons carry equal amounts of charge
two types of charge are possible
all of the above are accurate
A particle with a net charge of -2uC is halfway between two particles with a net
charge of +4 uC and +6uC respectively. The two positively charged particles are
10 cm apart. What is the magnitude of the net force on the negative particle
F=kqq/r^2
9x10^9 (4x10^-6)(4x10^-6)/.1^2
14.4
, charged particles A and B experience a statice electric force of F. If the distance
between the charge particles triples, then the static electric force becomes
1/9F
An electroscope is a device that has small gold foil strips suspended from a
metal rod. A student brings a negatively charged rod near the top of a neutral
electroscope. The student then briefly touches a hand to the top of the
electroscope before removing the charged rod. The foil strips of the electroscope
now spread apart. The student then brings a different rod near the top of the
electroscope. The leaves of the electroscope move closer together (see below).
The new rod must have a net charge that is
negative
which of the following statements concerning charge is most accurate
The total charge present in the system and surroundings is constant in any process
Twp neutral 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.
With the positive rod still present, the blocks seperate. As a result block B will
have a net charge that is
positive
the property of matter that is responsible for static electric effects is
charge
which of the following particles carries the positive type charge?
protons
Two charged spheres are suspended from strings. The charged spheres repel
each other. Which statement correctly explains this behavior
both spheres have a negative net charge
both spheres have a positive net charge
both a and b are correct
A particle with a mass of 0.01 kg and a net charge of -0.05 C accelerates from rest
through a uniform electric field. If the strength of the field is 2000 V/C, what is the
speed of the particle after traveling for 0.5 m?
Fd=1/2mv^2
qEd=1/2mv^2
sqrt(2qEd/m)=v
sqrt(2 (0.05) (2000) (.5)/0.01
100m/s
Two charged parallel plates have a uniform field strength of 1200N/C between
them. If the separation distance between the plates is 0.15m what is the potential
difference between the plates>
V=ER
V=1200 (0.15)
=180 V
an electron moves from a position next to a negatively charged source to a
position next to a positively charged source. Which statement is accurate?
The electron will lose energy and move to a higher potential
SALADO 2025-2026 NEW GENERATION
EXAM QUESTIONS AND ANSWERS
[CORREECT APPROVED & VERIFIED]
which of the following statements regarding static electric charge is most
accurate
force is proportional to the inverse square distance between the charged particles
An object has a positive net charge. The most likely reason for the net charge is
that
electrons were transferred off the object
what is the net charge on an object that has gained 8x10^13 electrons
8x10 ^13 * 1.6 x10^-19
=-1.3 x10^-5
which of the following processes will not result in a change in net charge on an
object?
polarization
which of the following is an example of an insulation
a piece of paper
a block of wax
a block of glass
all of the above are examples
which of the following statements concerning charge is most accurate
the total charge present in the system and surroundings is constant in any process
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 ?
The particles will repel. As they get further apart, the repelling force will decrease
Particle A has a net charge of -5uC. Particle B has a net charge +10uC. Which of
the following is the largest force?
they apply the same force on each other
Which of the following statements concerning the structure of an atom is
accurate?
neutrally charged atoms contain equal amounts of protons and electrons
Two identical metal blocks are in contact side-by-side. A positively charged rod
moves near the left block. Which of the following most accurately shows the
resulting distribution of charge throughout the metal blocks?
When a positively charged rod moves near the left of the block, it attracts or pulls
negative charge of the block.
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?
,The ballon caused the ceiling to polarize, which created a net attracting force between
the polarized ceiling and the balloon
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. If you bring a negatively charged rod near the top of a
negatively charged electroscope, the foil strips will
separate further
Which of the following is an accurate example of charging by induction
a student brings a charged rod near a block of metal. The student taps the block of
metal with a hand and then removed the charged rod
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.
F
Two charged spheres are suspended from strings. The charged spheres repel
each other which statement correctly explains this behavior
both spheres have a negative net charge
both spheres have a positive net charge
both a and b are possible
Three charged particles are held in place. Particle A has a net charge of +2 uC
and is at (0,0)m. Particle B has a net charge of -4uC and is placed a (.5,0) m.
Particle C has a net charge of -4uC and is at(0,0.5) m. What is the magnitude of
the net force on particle A
9x10^9 (2x10^-6)(4x10^-6)/.5^2
=0.082944 +0.082944
=.16588
sqrt(.16588)
=0.41
Three charged particles are held in place. particle A has a net charge of +2 uC and
is at (0,0)m. Particle B has a net charge of +4 uC and is placed a (0.5,0)m. Particle
C has a net charge of -4uC and is placed at (0,0.5)m. What is the angle of direction
of the net force acting on particle A
135 degrees
Which of the following statements regarding charge is most accurate?
charge is a fundamental property of matter
proteins and electrons carry equal amounts of charge
two types of charge are possible
all of the above are accurate
A particle with a net charge of -2uC is halfway between two particles with a net
charge of +4 uC and +6uC respectively. The two positively charged particles are
10 cm apart. What is the magnitude of the net force on the negative particle
F=kqq/r^2
9x10^9 (4x10^-6)(4x10^-6)/.1^2
14.4
, charged particles A and B experience a statice electric force of F. If the distance
between the charge particles triples, then the static electric force becomes
1/9F
An electroscope is a device that has small gold foil strips suspended from a
metal rod. A student brings a negatively charged rod near the top of a neutral
electroscope. The student then briefly touches a hand to the top of the
electroscope before removing the charged rod. The foil strips of the electroscope
now spread apart. The student then brings a different rod near the top of the
electroscope. The leaves of the electroscope move closer together (see below).
The new rod must have a net charge that is
negative
which of the following statements concerning charge is most accurate
The total charge present in the system and surroundings is constant in any process
Twp neutral 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.
With the positive rod still present, the blocks seperate. As a result block B will
have a net charge that is
positive
the property of matter that is responsible for static electric effects is
charge
which of the following particles carries the positive type charge?
protons
Two charged spheres are suspended from strings. The charged spheres repel
each other. Which statement correctly explains this behavior
both spheres have a negative net charge
both spheres have a positive net charge
both a and b are correct
A particle with a mass of 0.01 kg and a net charge of -0.05 C accelerates from rest
through a uniform electric field. If the strength of the field is 2000 V/C, what is the
speed of the particle after traveling for 0.5 m?
Fd=1/2mv^2
qEd=1/2mv^2
sqrt(2qEd/m)=v
sqrt(2 (0.05) (2000) (.5)/0.01
100m/s
Two charged parallel plates have a uniform field strength of 1200N/C between
them. If the separation distance between the plates is 0.15m what is the potential
difference between the plates>
V=ER
V=1200 (0.15)
=180 V
an electron moves from a position next to a negatively charged source to a
position next to a positively charged source. Which statement is accurate?
The electron will lose energy and move to a higher potential
