Summary

• Electrostatics
• Coulomb's law

• Class Quiz    Timer
  
  
• Electric field
  • definition
  • point charges applet
    
    Example #1
    
  • lines of force applet
    1. Lines point in direction of force
    2. Number of lines proportional to the charge
    3. Line density indicates field strength
  • video
  • force & acceleration applet
    
    Example #2
    
  • fields in two dimensions
    Example #3
    
  
  

gc6 tb16.11
A negatively charged rod is brought near one end of an uncharged metal bar. The end of the metal bar farthest from the charged rod will be charged
A. positive       B. negative
C. neutral         D. none of these
Answer







gc6 16.32
The electric field midway between two equal but opposite point charges is 745 N/C, and the distance between the charges is 16.0 cm. What is the magnitude of the charge on each?
A. 3.31×10^-9 C       B. 2.65×10^-10 C
C. 4.14×10^-6 C       D. 3.02×10⁸ C
Answer







sb5 23.44
What field is required to stop electrons having energy 1.60�10^-17 J in a distance of 10.0 cm?
A. 1.0 N/C          B. 10 N/C
C. 100 N/C         D. 1000 N/C
Answer







gc6 16.16mod
Calculate the electric field at Q using the figure if Q = 1 nC and l = 1 m.
A. 53.2 N/C at 121°
B. 14.8 N/C at 68°
C. 105 N/C at 168°
D. 37.6 N/C at -31°
Answer







 



B. negative
The positive charges in the metal bar will be attracted to the negatively charged rod, leaving the opposite end of the bar negatively charged. You can also say that the electrons in the metal bar are repelled by the negatively charged rod.












 



B. 2.65×10^-10 C













 



D. 1000 N/C













 



A. 53.2 N/C at 121° N