PHY 112 MIDTERM EXAM QUESTIONS
AND ANSWERS
Which of the following statements best describes conductors? -
correct answer ✅Conductors are metal and allow charge to move
freely through them
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 -
correct answer ✅1/9 F.
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? -
correct answer ✅0.34 m
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 balloon caused the ceiling to polarize, which
created a net attracting force between the polarized ceiling and the
balloon.
,PHY 112 MIDTERM EXAM QUESTIONS
AND ANSWERS
The property of matter that is responsible for static electric effects
is -
correct answer ✅charge.
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
++++++++ [A][B] -
correct answer ✅postitve.
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.
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
, PHY 112 MIDTERM EXAM QUESTIONS
AND ANSWERS
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 is most likely to have a net charge that is -
correct answer ✅negative.
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
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.
What is the net charge on an object that has gained 8 x 10^13
electrons? -
correct answer ✅-1.3 x 10^-5 C
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
AND ANSWERS
Which of the following statements best describes conductors? -
correct answer ✅Conductors are metal and allow charge to move
freely through them
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 -
correct answer ✅1/9 F.
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? -
correct answer ✅0.34 m
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 balloon caused the ceiling to polarize, which
created a net attracting force between the polarized ceiling and the
balloon.
,PHY 112 MIDTERM EXAM QUESTIONS
AND ANSWERS
The property of matter that is responsible for static electric effects
is -
correct answer ✅charge.
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
++++++++ [A][B] -
correct answer ✅postitve.
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.
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
, PHY 112 MIDTERM EXAM QUESTIONS
AND ANSWERS
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 is most likely to have a net charge that is -
correct answer ✅negative.
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
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.
What is the net charge on an object that has gained 8 x 10^13
electrons? -
correct answer ✅-1.3 x 10^-5 C
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
