1.A negatively charged rubber rod touches a balloon with no net charge before th
ID: 1563749 • Letter: 1
Question
1.A negatively charged rubber rod touches a balloon with no net charge before the rod touches it. The rod is then pulled away from the balloon. Will the rod then attract or repel the balloon? Explain your answer
2.A positively charged rod is brought near a balloon that originally has no net charge. A person then holds the balloon while the rod is near the balloon but not touching the balloon. The person then releases the balloon. Will the rod then attract or repel the balloon? Explain your answer
3. A rubber rod with a negative charge is brought near the top plate of an electroscope, but it doesn’t touch the top plate. The leaves of the electroscope repel each other. What will be the charge on the leaves? Explain .
4. If the negatively charged rubber rod touches the top plate of the electroscope and is then pulled away, what will be the charge on the leaves of the electroscope? Explain
5. If the negatively charged rubber rod is brought near the top plate of the electroscope but doesn’t touch the plate and someone touches the metal plate while the rod is held near the plate, what will be the charge on the leaves of the electroscope after the person moves away from the metal plate and the rubber rod is moved away from the electroscope? Explain
Explanation / Answer
(1)
Charging by contact places the same type of charge on the object being charged. So if a negatively charged rubber rod touches a baloon, then baloon becomes charged negatively.
Two like charges repel each other, therefore rod will repel the balloon.
(2)
Induction charging places a charge on an object which is opposite of the type of charge on the object used to charge it. The balloon will get negatively charged and as opposite charges attract each other,
rod will then attract the balloon.
(3)
This is a case of induction charging.
Induction charging places a charge on an object which is opposite of the type of charge on the object used to charge it. Thus, the electroscope leaves acquires a positive charge.
(4)
Charging by contact places the same type of charge on the object being charged. So if a negatively charged rubber rod touches an electroscope, then charge on the leaves of the electroscope will be negative.
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