Two large, flat, horizontally oriented plates are parallel to each other, a distance d apart. Half-way between the two plates the electric field field has a 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? A)
4E
B)
E/2
C)
0
D)
2E
E)
E
E
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A straight wire is carrying a current upward. Observed from above (i.e., looking downward towards the wire), the magnetic field lines are
A. radially outward. B. radially inward. C. forming clockwise circles. D. forming counter-clockwise circles. E. directed toward the observer.
Coulomb's Law: As shown in the figure, three charges are at the vertices of an equilateral triangle. The charge Q is 6.7 nC, and all the other quantities are accurate to two significant figures. What is the magnitude of the net electric force on the charge Q due to the other two charges? (k = 1/4??0 = 9.0 × 109 N ? m2/C2) 
A. 2.1 × 10-3 N B. 1.2 × 10-3 N C. 1.0 × 10-3 N D. 1.4 × 10-3 N
A bare roof on a warmly heated home on a snowy day indicates
A) an unwanted flow of heat B) poor insulation. C) fairly good conductivity. D) all of the above
When water boils in Denver, Colorado (elevation 5,200 ft) is its temperature greater than, less than, or equal to the temperature of boiling water in Dallas, Texas (elevation 450 ft).
A. greater than B. less than C. equal to