The graph in the figure shows the electric field strength (not the field lines) as a function of distance from the center for a pair of concentric uniformly charged spheres.
Which of the following situations could the graph plausibly represent? (There may be more than one correct choice.)
A) a positively charged conducting sphere within another positively charged conducting sphere
B) a positively charged conducting sphere within an uncharged conducting sphere
C) a solid nonconducting sphere, uniformly charged throughout its volume, inside of a positively charged conducting sphere
D) a positively charged nonconducting thin-walled spherical shell inside of a positively charged conducting sphere
E) a positively charged nonconducting thin-walled spherical shell inside of another positively charged nonconducting thin-walled spherical shell
Question 2
The electric field strength in the space between two closely spaced parallel disks is .0 105 N/C. This field is the result of transferring 3.9 109 electrons from one disk to the other.
What is the diameter of the disks? (e = 1.60 10-19 C, 0 = 8.85 10-12 C2/N m2)
A) 3.0 cm
B) 1.5 cm
C) 4.5 cm
D) 6.0 cm
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