RIO SALADO physics 112 midterm questions
and answers 2026\2027 A+ Grade
which of the following statements regarding static electric charge is most accurate
- correct answer 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
- correct answer electrons were transferred off the object
what is the net charge on an object that has gained 8x10^13 electrons
- correct answer 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?
- correct answer polarization
which of the following is an example of an insulation
- correct answer 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
- correct answer 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 ?
- correct answer 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?
- correct answer they apply the same force on each other
Which of the following statements concerning the structure of an atom is accurate?
- correct answer 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?
- correct answer 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?
- correct answer 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
- correct answer separate further
Which of the following is an accurate example of charging by induction
- correct answer 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.
- correct answer F
Two charged spheres are suspended from strings. The charged spheres repel each other which
statement correctly explains this behavior
- correct answer 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
- correct answer 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
- correct answer 135 degrees
Which of the following statements regarding charge is most accurate?
- correct answer 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
- correct answer 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
- correct answer 1/9F
and answers 2026\2027 A+ Grade
which of the following statements regarding static electric charge is most accurate
- correct answer 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
- correct answer electrons were transferred off the object
what is the net charge on an object that has gained 8x10^13 electrons
- correct answer 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?
- correct answer polarization
which of the following is an example of an insulation
- correct answer 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
- correct answer 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 ?
- correct answer 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?
- correct answer they apply the same force on each other
Which of the following statements concerning the structure of an atom is accurate?
- correct answer 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?
- correct answer 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?
- correct answer 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
- correct answer separate further
Which of the following is an accurate example of charging by induction
- correct answer 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.
- correct answer F
Two charged spheres are suspended from strings. The charged spheres repel each other which
statement correctly explains this behavior
- correct answer 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
- correct answer 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
- correct answer 135 degrees
Which of the following statements regarding charge is most accurate?
- correct answer 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
- correct answer 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
- correct answer 1/9F
