Summary

• Capacitance
• Combinations of capacitors
• Energy storage

• Dielectrics
• PhET Capacitor Lab

Example #1
Example #2
Example #3


• The PhET Capacitor Lab



• Prepare:
  Read textbook sections 26-1 through 26-4 before the next lecture

POP5 20.64
A 95.0 nF commercial capacitor is to be made from foil and paper strips that are 7.00 cm wide. How long should the strips be if the paper is 0.0250 mm thick and has a dielectric constant of 3.70?
A. 15.1 cm
B. 28.1 cm
C. 0.728 m
D. 1.04 m
Answer













POP5 Ex. 20.10mod
A 2.00 µF capacitor is charged to 12.0 V by a battery. The battery is then removed and a slab of Pyrex glass is inserted between the plates. How much energy is stored before the glass is inserted?
A. 25.7 µJ
B. 144 µJ
C. 422 µJ
D. 806 µJ
Answer













POP5 Ex. 20.10mod
A 2.00 µF capacitor is charged to 12.0 V by a battery. The battery is then removed and a slab of Pyrex glass is inserted between the plates. How much energy is stored after the glass is inserted? (See Table 25.1 p. 677)
A. 25.7 µJ
B. 144 µJ
C. 806 µJ
D. 4.52 mJ
Answer

























 



D. 1.04 m




















 



B. 144 µJ




















 



A. 25.7 µJ