The force of attraction that a -40.0 C point charge exerts on a ...

[NguyenJ]

The force of attraction that a -40.0 C point charge exerts on a +108 C point charge has magnitude 4.00 N. How far apart are these two charges? (k = 1/40 = 8.99  109 N  m2/C2)
 
  A) 2.10 m
  B) 3.67 m
  C) 3.12 m
  D) 2.49 m
  E) 1.13 m

Question 2

When a 6.00-F air-filled capacitor has a charge of 40.0 C on its plates, how much potential energy is stored in this capacitor?
 
  A) 103 J
  B) 113 J
  C) 123 J
  D) 133 J
  E) 143 J

[CharlieArnold]

Answer to Question 1

C

Answer to Question 2

D

[NguyenJ]

Thanks for the timely response, appreciate it

[Jsherida]

Wow, this really help