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For items 12-15, refer to figure 1.
Plastic rod
Aluminum leaves
Figure 1. Reaction of aluminum
leaves to the charge
plastic rod.
12. What is the charge of the plastic rod in figure 1?
A. negative
C. positive
B. neutral
D. unknown
If you rub a glass rod with a cloth, the charge produced on the glass rod is called positive, whereas when a plastic rod is rubbed with a cloth, the charge produced on the plastic rod is negative.
13. Which of the following explains the response of the
13. Which of the following explains the response of thealuminum leaves?
A. Newton's Law
B. Electrostatic Law
C. Law of Acceleration
D. Law of Conservation of Charge
This means that the pieces of aluminium have lost some electrons and so have an overall positive charge. Both pieces of aluminium foil are then positively charged. Like charges repel each other and so the pieces of aluminium foil move apart from each other.
14. What is the device used to detect this charge?
A. electroscope
C. oscilloscope
B. microscope
D. telescope
electroscope
electroscopeelectroscope, instrument for detecting the presence of an electric charge or of ionizing radiation, usually consisting of a pair of thin gold leaves suspended from an electrical conductor that leads to the outside of an insulating container.
15. How were the aluminum leaves charged by the plastic rod? By_
A. conduction
B. convection
C. friction
D. reduction
In saying "like charges repel", we would mean the the negative rubber rod repels the negatively-charged electrons within the can. This is also causes the can to become polarized. In both instances, the polarization of the aluminum can causes it to be attracted to the charged rod.
Answer:
12)A. negative
13)D. Law of Conservation of Charge
14)A. electroscope
15)A. conduction
Explaination:
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