Question

Match each action with the charging method it demonstrates.

Column A
1.
rubbing a balloon on hair:
rubbing a balloon on hair
2.
touching a metal sphere with a negatively charged rod:
touching a metal sphere with a negatively charged rod
3.
moving a negatively charged rod near a metal sphere; touching a grounded sphere:
moving a negatively charged rod near a metal sphere; touching a grounded sphere
4.
touching a metal sphere with a positive aluminum plate:
touching a metal sphere with a positive aluminum plate
Column B
a.charging by induction
b.charging by conduction
c.charging by friction
Question 2 (1 point)
The pictures show four electrically charged items.



If a student rubs a glass rod with a piece of silk, giving the rod a positive charge, which of the items will the rod attract?

a
Plastic sheet 1, only
b
Balloon 1 and Plastic sheet 2
c
Balloon 1, only
d
Balloon 2 and Plastic sheet 1
Question 3 (1 point)
Gillian is investigating the distribution of charge in objects using friction. Gillian gently rubs a rubber balloon on the fur of her pet cat. When she pulls the balloon away from the cat's fur, the fur is attracted to the balloon. Which best explains why the fur becomes attracted to the balloon?

a
Rubbing the balloon along the cat transfers extra electrons from the cat to the balloon.
b
Rubbing the balloon along the cat transfers extra protons from the balloon to the cat.
c
Rubbing the balloon along the cat creates extra protons that will stick to both the balloon and cat.
d
Rubbing the balloon along the cat creates extra electrons that will stick to both the balloon and cat.
Question 4 (1 point)
The drawing shows a student holding two negatively charged balloons.



What is most likely to occur if the student brings the balloons closer to each other?

a
The magnitude of the electrostatic force between the balloons will increase, and they will repel each other.
b
The magnitude of the electrostatic force between the balloons will decrease, and they will attract each other.
c
The magnitude of the electrostatic force between the balloons will increase, and they will attract each other.
d
The magnitude of the electrostatic force between the balloons will decrease, and they will repel each other.
Question 5 (1 point)
When combing one's hair, the comb becomes positively charged. What happens to the hair being combed?

a
It becomes positively charged.
b
It stays uncharged.
c
It loses electrons.
d
It becomes negatively charged.
Question 6 (1 point)
A student rubs a rubber rod with fur, producing a negative charge on the rod. The student then touches the rod to a hollow, neutral metal sphere that stands on an insulating plastic stand. This transfers negative charges from the rod to the sphere:

image 63f9196b581c4f17bbe56cfd6ddd781f

Which statement best predicts what will happen to the charge, and why?

a
It will quickly spread to the air around the sphere, because it will seek to occupy as large a volume of neutral matter as possible.
b
It will slowly drift to the bottom of the sphere, because the charges rapidly attach to individual atoms, making them slightly heavier than surrounding atoms.
c
It will remain at the point of contact between the rod and the sphere, because resistance in the metal prevents the charges from easily moving.
d
It will distribute itself evenly over the surface of the sphere, because like charges repel and the sphere is a conductor.
Question 7 (1 point)
Which occurs when neutral object A is charged by induction by charged object B?

a
Charge transfers from object B to object A.
b
Charges on object B are rearranged.
c
Charges on object A are rearranged.
d
Charge transfers from object A to object B.

Answer 1

Here are the answers:

Question 1 (match):
1 → c (friction)
2 → b (conduction)
3 → a (induction)
4 → b (conduction)

Question 2:
b. Balloon 1 and Plastic sheet 2

Question 3:
a. Rubbing the balloon along the cat transfers extra electrons from the cat to the balloon.

Question 4:
a. The magnitude of the electrostatic force will increase, and they will repel each other.

Question 5:
d. It becomes negatively charged.

Question 6:
d. It will distribute itself evenly over the surface of the sphere, because like charges repel and the sphere is a conductor.

Question 7:
c. Charges on object A are rearranged.