A thin spherical shell of radius 20.0 cm has 5.0 ?C of charge uniformly distributed over its surface. What is the electric field 10.0 cm from the center of the sphere?
A. 
inward
B. 
outward
C. 
inward
D. 
outward
E. 0
E. 0
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What event made it possible for photons to begin to travel freely through the universe when the universe was about 380,000 years old?
A) Magnetic fields had weakened to the point that they no longer interfered with light. B) The universe had expanded and cooled enough for electrons to combine with nuclei to form neutral atoms. C) Atomic nuclei were finally able to escape the plasma of the early universe. D) Atoms started to combine to make the first molecules. E) Fusion of hydrogen to make helium ceased.
X-ray bursters are similar to novae, except the collapsed star is a neutron star, not a white dwarf
Indicate whether the statement is true or false
A segment of wire carries a current of 25 A along the x axis from x = ?2.0 m to x = 0 and then along the z axis from z = 0 to z = 3.0 m. In this region of space, the magnetic field is equal to 40 mT in the positive z direction. What is the magnitude of the force on this segment of wire?
A. 1.0 N B. 5.0 N C. 2.0 N D. 3.6 N E. 3.0 N
A particle (q = 4.0 mC, m = 50 g) has a velocity of 25 m/s in the positive x direction when it first enters a region where the electric field is uniform (60 N/C in the positive y direction). What is the speed of the particle 5.0 s after it enters this region?
a. 49 m/s b. 35 m/s c. 32 m/s d. 44 m/s e. 24 m/s