Practice important
Induced Charges
MCQ questions and answers.
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MCQ Questions
1. What happens when a positively charged rod is brought near an uncharged insulating object?
A.
The charges in the insulator become slightly separated
B.
All electrons leave the insulator
C.
The insulator becomes permanently positively charged
D.
No effect occurs inside the insulator
Correct Answer:
The charges in the insulator become slightly separated
Explanation:
The electric field of the nearby charged rod causes a small displacement of positive and negative charges within the insulator. This separation produces induced charges or polarization.
2. In an insulator, induced charges are generally described as:
A.
Free charges moving throughout the material
B.
Bound charges that are slightly displaced
C.
Charges created from nothing
D.
Charges that immediately leave the material
Correct Answer:
Bound charges that are slightly displaced
Explanation:
Insulators do not have freely moving charge carriers. Their bound positive and negative charges shift slightly under an external electric field, producing induced charges.
3. A negatively charged rod is brought near an uncharged insulator. Which charge is induced on the nearer surface?
A.
Negative charge
B.
Positive charge
C.
No charge of any kind
D.
Both surfaces become permanently positive
Correct Answer:
Positive charge
Explanation:
The negative rod repels electrons slightly away from the nearer region of the insulator. The nearer surface therefore becomes relatively positive by induction.
4. What is the main cause of induced charges in an insulating material?
A.
An external electric field
B.
An increase in temperature only
C.
The complete removal of atoms
D.
A chemical reaction in the material
Correct Answer:
An external electric field
Explanation:
An external electric field exerts opposite forces on positive and negative charges in the insulator, causing a slight separation and producing induced charges.
5. When a charged body is removed from a polarized insulator, what usually happens to the induced charges?
A.
They disappear as the charges return nearly to their original positions
B.
They become permanently doubled
C.
They leave the insulator as a current
D.
They change into neutrons
Correct Answer:
They disappear as the charges return nearly to their original positions
Explanation:
Induced charges in an insulator are usually due to temporary displacement of bound charges. When the external charged body is removed, the polarization generally decreases.
6. A neutral insulating sphere is placed near a positively charged object. The side of the sphere closest to the object becomes:
A.
Relatively negative
B.
Relatively positive
C.
Completely uncharged while the other side is also uncharged
D.
Permanently positively charged
Correct Answer:
Relatively negative
Explanation:
The positive object attracts the negative bound charges slightly toward the nearer side of the insulating sphere, making that side relatively negative.
7. Why does an uncharged insulator become attracted to a charged object?
A.
Induced charges make the nearer side oppositely charged
B.
The insulator gains the same charge everywhere
C.
The insulator loses all its electrons
D.
Gravity becomes zero near the charged object
Correct Answer:
Induced charges make the nearer side oppositely charged
Explanation:
Polarization places an induced charge opposite to the external charge on the nearer side. This closer attraction is stronger than the repulsion from the farther side, producing a net attraction.
8. Which statement correctly describes polarization of an insulator?
A.
Positive and negative bound charges shift slightly in opposite directions
B.
All atoms become positively charged
C.
Electrons move freely from one end to the other
D.
The total number of charges in the material increases
Correct Answer:
Positive and negative bound charges shift slightly in opposite directions
Explanation:
Polarization occurs when an electric field produces a small opposite displacement of positive and negative bound charges within the insulator.
9. A neutral insulator near a charged rod is polarized. What is the net charge of the insulator as a whole?
A.
Zero
B.
Equal to the charge on the rod
C.
Always positive
D.
Always negative
Correct Answer:
Zero
Explanation:
Induction in an insulator separates existing positive and negative charges but does not usually add or remove charge. Therefore, the total charge of the insulator remains zero.
10. Which part of a polarized insulator has the greater effect on its attraction to a nearby charged object?
A.
The nearer oppositely charged side
B.
The farther oppositely charged side
C.
The center only
D.
A region outside the insulator
Correct Answer:
The nearer oppositely charged side
Explanation:
The electric force is stronger at a smaller distance. Thus, the induced opposite charge on the nearer side produces a stronger attraction than the repulsion from the farther side.
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Induced Charges
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