A solid non-conducting sphere of radius R carries a uniform charge density. At a radial distance r1 = R/4 the electric field has a magnitude E0. What is the magnitude of the electric field at a radial distance r2 = 2R?
A)
E0/4
B)
0
C)
E0/2
D)
E0
E)
2E0
D
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What observation has prompted astronomers to ponder the possible existence of dark energy?
a. Discovery of quasars b. Discovery of superclusters c. Supernovae appear fainter than expected at large redshifts. d. Uniform nature of the cosmic microwave background (CMB).
Typically a granule in the photosphere is about
A) the size of Texas, about 1,000 km across. B) the size of our Moon, about 3,000 km across. C) as big as Jupiter, around 100,000 km wide. D) the size of Earth, around 12,000 km across. E) the size of a city, 20-30 kilometers across.
An electron situated near another electron would feel
A. a repulsive magnetic force. B. an attractive electrical force. C. a repulsive electrical force. D. an attractive magnetic force. E. no forces from the other electron.
If a = 60 cm, b = 80 cm, Q = ?6.0 nC, and q = 4.0 nC, what is the magnitude of the electric field at point P?
a.
35 N/C
b.
42 N/C
c.
52 N/C
d.
64 N/C
e.
104 N/C