PORTAGE PHYS 165 MODULE 7 EXAM QUESTIONS
AND ANSWERS
/. 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
AND ANSWERS
/. 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
