Three charges are placed as follows along the x- and y-axis of an ...

[Jkov05]

Three charges are placed as follows along the x- and y-axis of an xy-coordinate system: q1 = 2.00 C at x1 = 0 m, q2 = -4.00 C at x2 = 3.00 m, and q3 = 6.00 C at y = 4.00 m. What is the electric potential energy of this system of charges?
 
  A) -40.2 mJ
  B) 40.2 mJ
  C) -94.2 mJ
  D) 94.2 mJ
  E) 0 J

Question 2

If the threshold wavelength to dislodge electrons from a metal is 373. nm, what is the work function?
 
  What will be an ideal response?

[FergA]

Answer to Question 1

A

Answer to Question 2

3.33 eV