1)Two large, flat, horizontally oriented plates are parallel to each other, a distance d apart. Half way between the two plates the electric field has magnitude E. If the separation of the plates is reduced to d/2 what is the magnitude of the electric field half way between the plates?
2) X and Y are two uncharged metal spheres on insulating stands, and are in contact with each. A positively charged rod R is brought close to X as shown in Figure (a).
Sphere Y is now moved away from X, as in Figure (b).
What are the final charge states of X and Y?
A) X is neutral and Y is positive.
B) X is negative and Y is positive.
C) Both X and Y are neutral.
D) X is positive and Y is neutral.
E) Both X and Y are negative.
3) A piece of plastic has a net charge of +2.00 μC. How many more protons than electrons does this piece of plastic have? (e = 1.60 × 10-19 C).
A) 1.25 × 1019
B) 2.50 × 1019
C) 1.25 × 1013
D) 2.50 × 1013
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