1. When an insulator is given an electric charge, where does the charge generally remain?
A.
It spreads uniformly throughout the insulator
B.
It remains localized near the place where it is deposited
C.
It immediately moves to the ground
D.
It disappears after a short time
Correct Answer:
It remains localized near the place where it is deposited
Explanation:
In an insulator, charges cannot move freely, so the deposited charge remains localized near its point of application.
2. Why does charge localization occur in an insulating material?
A.
Its electrons are tightly bound to atoms
B.
Its atoms contain no electrons
C.
Its protons can move freely through the material
D.
It has an unlimited supply of free charges
Correct Answer:
Its electrons are tightly bound to atoms
Explanation:
The electrons in an insulator are strongly bound to their atoms, preventing charge from moving freely through the material.
3. A plastic rod is charged by rubbing one end. Where will most of the excess charge remain?
A.
Only at the opposite end
B.
Uniformly throughout the rod
C.
Near the rubbed region
D.
At the center of the rod only
Correct Answer:
Near the rubbed region
Explanation:
Plastic is an insulator, so the charge produced by rubbing remains concentrated near the rubbed region.
4. Which material is most likely to retain charge locally after being rubbed?
A.
Copper
B.
Aluminium
C.
Plastic
D.
Silver
Correct Answer:
Plastic
Explanation:
Plastic is an insulator, so charge cannot easily move through it and remains localized near the rubbed area.
5. If a charged insulating rod is touched at one end, what usually happens to the charge on the rod?
A.
It spreads instantly over the entire rod
B.
It remains mostly near its original location
C.
It changes completely into heat
D.
It moves freely into the surrounding air
Correct Answer:
It remains mostly near its original location
Explanation:
Because an insulator has very few mobile charge carriers, touching it does not cause the charge to spread freely through the rod.
6. Which statement correctly describes charge on an insulating sphere?
A.
Charge placed at one point generally remains localized there
B.
Charge always moves to the lowest point
C.
Charge immediately leaves the sphere
D.
Charge always becomes uniformly distributed without movement
Correct Answer:
Charge placed at one point generally remains localized there
Explanation:
On an insulating sphere, charges are not free to move over the surface, so charge placed at one point generally remains localized.
7. Compared with a conductor, charge on an insulator is generally:
A.
More localized
B.
More freely distributed
C.
Always zero
D.
Unable to produce an electric field
Correct Answer:
More localized
Explanation:
Charges in an insulator have restricted movement, so they remain more localized than charges on a conductor.
8. A small region of an insulating material is charged positively. What happens to the positive charge?
A.
It quickly spreads throughout the material
B.
It remains concentrated near the charged region
C.
It changes into negative charge
D.
It moves only to the bottom surface
Correct Answer:
It remains concentrated near the charged region
Explanation:
The lack of freely moving charge carriers in an insulator keeps the positive charge concentrated near the region where it was produced.
9. Which action is most likely to produce a localized charge on an insulator?
A.
Rubbing a particular region of a plastic rod
B.
Connecting a metal wire across the rod
C.
Heating the entire rod until it melts
D.
Submerging the rod in a conducting liquid
Correct Answer:
Rubbing a particular region of a plastic rod
Explanation:
Rubbing transfers charge to a specific region of the plastic, and the insulating material prevents that charge from spreading far.
10. What is the main difference between charge on an insulator and charge on a conductor?
A.
Charge is localized on an insulator but can move freely on a conductor
B.
Charge is localized on a conductor but not on an insulator
C.
Charge exists only on conductors
D.
Charge cannot remain on an insulator
Correct Answer:
Charge is localized on an insulator but can move freely on a conductor
Explanation:
Insulators restrict charge movement, causing localization, whereas conductors contain mobile charges that can move through the material.
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