Three equal charges of magnitude + 4.00 C are placed at the ...

[armygirl]

Three equal charges of magnitude + 4.00 C are placed at the corners of an equilateral triangle of side 2.00 cm. What is the electric potential energy of the system of these charges?
 
  A)
 
  90.0 J
  B)
 
  900 mJ
  C)
 
  0 J
  D)
 
  216 mJ
  E)
 
  21.6 J

Question 2

What is the critical angle for light traveling from crown glass (n = 1.52 ) into water (n = 1.33)?
 
  A)
 
  42
  B)
 
  48
  C)
 
  53
  D)
 
  57
  E)
 
  61

[meryzewe]

Answer to Question 1

E

Answer to Question 2

E

[armygirl]

YES! Correct, THANKS for helping me on my review

[kishoreddi]

Thanks for the timely response, appreciate it