If the sun is at one focus of the ellipse, what is at the other focus?
What will be an ideal response?
Nothing
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Potential Energy: Point charges +4.00 ?C and +2.00 ?C are placed at the opposite corners of a rectangle as shown in the figure. If these charges are released and are free to move with no friction, what is the maximum amount of kinetic energy they will gain? (k = 1/4??0 = 8.99 × 109 N ? m2/C2) 
Fill in the blank(s) with the appropriate word(s).
The electric field in the region defined by the y-z plane and the negative x axis is given by E = ?ax, where a is a constant. (There is no field for positive values of x.) As ?x increases in magnitude, relative to V = 0 at the origin, the electric potential in the region defined above is
A. a decreasing function proportional to ?|x2|. B. a decreasing function proportional to ?|x|. C. constant. D. an increasing function proportional to +|x|. E. an increasing function proportional to +|x2|.
A spherical, non-conducting shell of inner radius r1= 10 cm and outer radius r2= 15 cm carries a total charge Q = 15 ?C distributed uniformly throughout its volume
What is the electric field at a distance r= 12 cm from the center of the shell? A) 5.75 × 103 N/C B) 0 C) 2.87 × 106 N/C D) 5.75 × 106 N/C E) 2.87 × 103 N/C
A charge, +Q, is placed inside a balloon and the balloon is inflated. As the radius of the balloon r increases the number of field lines going through the surface of the balloon:
a. increases proportional to r2. c. stays the same. b. increases proportional to r. d. decreases as 1/r.