Portage Phys 165 Module 7 Exam Complete Test , Practice Questions,
Verified Answer Key, and Study Guide for (Latest 2026 Edition)
True or False: Atoms are made up of protons, neutrons, and electrons. Protons carry a positive charge,
electrons carry a negative charge, and neutrons do not carry any charge. - (answer)True
True or False: When something acquires a net charge, it can be either the protons or the electrons that
move, but not the neutrons. - (answer)False
What is the unit of charge? - (answer)Coulombs
True or False: Two identical, conductive spheres have net charges on them. Sphere A has a net charge of
+2.50 mC and sphere B has a net charge of +3.81 mC. The two spheres are released in space and move
only because of the electrostatic forces between them. When released, the two spheres should move
away from each other. - (answer)True
What is the name of a device that stores electric charge? - (answer)Capacitor
A variable capacitor has too much capacitance. Which of the following changes would NOT reduce the
capacitance of this capacitor? - (answer)Switch the dielectric for a new one that has a larger dielectric
constant
When you rub a balloon on your hair, it scrapes electrons off your hair and deposits them onto the
balloon. The balloon becomes negatively charged, and your hair becomes positively charged. What is
the name of this process of charging an object? - (answer)Fricton
True or False: The Fundamental Law of Electrostatics states that opposite charges repel each other while
like charges attract each other. - (answer)False. Opposite Charges Attract/Like Charges Repel
When a lightning bolt strikes a tree, -8.42 C of charge is transferred from the ground up to the clouds.
How many electrons were transferred to the clouds from the tree? - (answer)Take the charge; convert
using (1e-/-1.60x10^-19C)
Answer in electrons
, Portage Phys 165 Module 7 Exam Complete Test , Practice Questions,
Verified Answer Key, and Study Guide for (Latest 2026 Edition)
An atom of Potassium-40 has 19 protons, 20 neutrons, and 18 electrons. What is the sign and magnitude
of the net charge of this atom in Coulombs? - (answer)19-18 = +1e- (1.60x10^-19/1e-) = 1.60x10^-19
Answer in C
A purple metal nut has been given a net charge of + 6325 nC, and an orange metal nut has been given a
net charge of - 3614 nC. Answer the following questions:
a. What is the magnitude of the electrostatic force between these two nuts if they are separated by 25
cm?
b. Is the force attractive or repulsive?
c. Which nut has the largest electrostatic force acting on it? - (answer)a) F= k*q1*q2/r^2 where k=
9.0x10^9Nm^2/kg^2
Answer in Newtons
b) Force is negative so it's attractive
c) Both nuts feel the same force
A proton is in an electric field with a magnitude of 3.79 x 106 N/C directed to the West.
a. What is the magnitude of the electric force acting on the proton?
b. In what direction is the force acting on the proton?
c. If this is the only force acting on the proton and the mass of the proton is 1.67 x 10-27 kg, what is the
acceleration of the proton?
d. If the proton is replaced with an electron, how will the magnitude and direction of the force acting on
the electron compare to the force exerted on the proton? - (answer)a) E=F/q Revised as F=EQ Answer in
Newtons
B) West
C) Use F=ma Revised as a=F/m Answer in m/s^2
D) It is the same magnitude, directed East
Verified Answer Key, and Study Guide for (Latest 2026 Edition)
True or False: Atoms are made up of protons, neutrons, and electrons. Protons carry a positive charge,
electrons carry a negative charge, and neutrons do not carry any charge. - (answer)True
True or False: When something acquires a net charge, it can be either the protons or the electrons that
move, but not the neutrons. - (answer)False
What is the unit of charge? - (answer)Coulombs
True or False: Two identical, conductive spheres have net charges on them. Sphere A has a net charge of
+2.50 mC and sphere B has a net charge of +3.81 mC. The two spheres are released in space and move
only because of the electrostatic forces between them. When released, the two spheres should move
away from each other. - (answer)True
What is the name of a device that stores electric charge? - (answer)Capacitor
A variable capacitor has too much capacitance. Which of the following changes would NOT reduce the
capacitance of this capacitor? - (answer)Switch the dielectric for a new one that has a larger dielectric
constant
When you rub a balloon on your hair, it scrapes electrons off your hair and deposits them onto the
balloon. The balloon becomes negatively charged, and your hair becomes positively charged. What is
the name of this process of charging an object? - (answer)Fricton
True or False: The Fundamental Law of Electrostatics states that opposite charges repel each other while
like charges attract each other. - (answer)False. Opposite Charges Attract/Like Charges Repel
When a lightning bolt strikes a tree, -8.42 C of charge is transferred from the ground up to the clouds.
How many electrons were transferred to the clouds from the tree? - (answer)Take the charge; convert
using (1e-/-1.60x10^-19C)
Answer in electrons
, Portage Phys 165 Module 7 Exam Complete Test , Practice Questions,
Verified Answer Key, and Study Guide for (Latest 2026 Edition)
An atom of Potassium-40 has 19 protons, 20 neutrons, and 18 electrons. What is the sign and magnitude
of the net charge of this atom in Coulombs? - (answer)19-18 = +1e- (1.60x10^-19/1e-) = 1.60x10^-19
Answer in C
A purple metal nut has been given a net charge of + 6325 nC, and an orange metal nut has been given a
net charge of - 3614 nC. Answer the following questions:
a. What is the magnitude of the electrostatic force between these two nuts if they are separated by 25
cm?
b. Is the force attractive or repulsive?
c. Which nut has the largest electrostatic force acting on it? - (answer)a) F= k*q1*q2/r^2 where k=
9.0x10^9Nm^2/kg^2
Answer in Newtons
b) Force is negative so it's attractive
c) Both nuts feel the same force
A proton is in an electric field with a magnitude of 3.79 x 106 N/C directed to the West.
a. What is the magnitude of the electric force acting on the proton?
b. In what direction is the force acting on the proton?
c. If this is the only force acting on the proton and the mass of the proton is 1.67 x 10-27 kg, what is the
acceleration of the proton?
d. If the proton is replaced with an electron, how will the magnitude and direction of the force acting on
the electron compare to the force exerted on the proton? - (answer)a) E=F/q Revised as F=EQ Answer in
Newtons
B) West
C) Use F=ma Revised as a=F/m Answer in m/s^2
D) It is the same magnitude, directed East
