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UNIT 3 - ELECTRIC, GRAVITATIONAL, AND MAGNETIC FIELDS

Chapter 7 - Electric Charges and Electric Fields

7.1 Electric Charge and the Electrical Structure of Matter
7.3 Electric Fields
Chapter 7 Review (p. 381)

Chapter 7 - Electric Charges and Electric Fields

7.1 Electric Charge and the Electrical Structure of Matter

Section 7.1 Questions (p. 326)

9. Laser printers work on principles similar to electrostatic photocopiers. Research laser printer technology and answer the following questions:
   1. What is the role of the laser in making the printouts?
   2. Why are copies made from laser printers of such high quality?

10. Fabric softener sheets claim to reduce static cling between the clothes in a dryer. Research fabric softeners and answer the following questions:
    1. Why do clothes cling to each other when they are removed from a dryer?
    2. How does a fabric softener sheet alleviate the problem?

11. Long, thin conducting strips are placed near the ends of airplane wings to dissipate the charge that builds up on the plane during flight. Research this technology and answer the following questions:
    1. Why does an airplane develop a charge in flight?
    2. What feature of the atmosphere plays a role in removing the charge from the plane?
    3. Why are the conducting strips long and thin and placed near the end of the wings?

15. The hammerhead shark is just one of many fish that use electric fields to detect and stun prey. Eels, catfish, and torpedo fish exhibit similar capabilities. Research one of these fish, comparing its abilities with the hammerhead's, and write a short report on your findings.

42. Research the principles of piezoelectric crystals and the use of these crystals in wristwatches. Write a one-page report.