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Authoritative PPT Summary
"Charge" Simple Circuit PPT Courseware 7
Project main content
Frictional electrification: A rubbed hard rubber rod or glass rod can attract light and small objects. We say that the hard rubber rod or glass rod is charged, or that it has ______. The phenomenon of making objects electrified by friction is called ______
Frictional electrification does not create charges, but transfers ______ from one object to another. The object that loses ______ is positively charged, and the object that gains ______ is negatively charged.
two kinds of charge
Positive charge The charge on ______ rubbed with silk is defined as positive charge.
Negative charge The charge on ______ that has been rubbed with fur is defined as negative charge.
How to check whether an object is charged
(1) Utilize the property of charged bodies to attract light and small objects.
Method: Bring the object close to a light and small object (such as small scraps of paper, etc.). If the two attract each other, it proves that the object is charged.
(2) Utilize the law of interaction between charges.
Method: Put the object close to the known charged body. If the object and the known charged body attract each other, it means that the object and the known charged body have opposite electrical properties or the object is not charged; if the object and the known charged body repel each other, it means that the object and the known charged body are mutually repulsive. It is known that the electrical properties of charged objects are the same.
(3) Use an electroscope.
Method: Touch the object to be measured to the metal ball of the electroscope. If the metal foil opens, it proves that the object to be measured is charged.
[Example] An electroscope is often used in the laboratory to test whether an object is charged. A glass rod rubbed with silk is used to contact the metal ball of the electroscope. It can be found that the two metal foils of the electroscope will open due to repulsion. For this The correct understanding of the phenomenon is ()
A. The metal foil is positively charged, and the metal ball is uncharged.
B. Both the metal foil and the metal ball are positively charged
C. The metal foil is positively charged and the metal ball is negatively charged.
D. Both the metal foil and the metal ball are negatively charged
Analysis: The glass rod rubbed with silk is positively charged. When the glass rod is brought into contact with the metal ball of the electroscope, both the metal foil and the metal ball are positively charged. The two metal foils will repel each other and open because they have the same charge.
1. When a balloon that has been rubbed against a woolen sweater is brought close to the hair, the hair will be _________ uncharged due to the _________ caused by the friction of the balloon.
2. Bring the negatively charged object A close to the insulating ball hanging under the thin wire, and the ball will be repelled; if a positively charged object B is used to approach but not touch the ball, the ball ()
A.Stand still
B. Must be attracted to object B
C. Must be repelled by object B
D. It may be repelled by object B, or it may be attracted by object B
3. The metal foil of the electroscope opens, indicating that the electroscope ()
A. Not charged B. Positively charged
C. Negatively charged D. May be positively charged or negatively charged
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