If a = 60 cm, b = 80 cm, Q = ?6.0 nC, and q = 6.0 nC, what is the magnitude of the electric field at point P in the figure?
a.
65 N/C
b.
55 N/C
c.
60 N/C
d.
52 N/C
e.
67 N/C
d
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Which of the following best describes why a white dwarf cannot have a mass greater than the 1.4-solar-mass limit?
A) The upper limit to a white dwarf's mass is something we have learned from observations, but no one knows why this limit exists. B) Electron degeneracy pressure depends on the speeds of electrons, which approach the speed of light as a white dwarf's mass approaches the 1.4-solar-mass limit. C) White dwarfs get hotter with increasing mass, and above the 1.4-solar-mass limit they would be so hot that even their electrons would melt. D) White dwarfs are made only from stars that have masses less than the 1.4-solar-mass limit.
Two space stations are at rest relative to each other and are 6.0 × 107 m apart, as measured by observers on the stations
A spaceship traveling from one station to the other at 0.90c relative to the stations passes both of them, one after the other. As measured by an observer in the spaceship, how long does it take to travel from one station to the other? (c = 3.00 × 108 m/s) A) 97 ms B) 510 ms C) 39 ms D) 220 ms E) 58 ms
A long wire along the x axis is carrying a current increasing at a constant rate in the +x direction. A rectangular coil lies in the x-y plane in the 4th quadrant. In which direction is the induced magnetic field at the center of the rectangular coil?
a. in the –z direction b. There is no direction; the induced current in the coil is zero since the x axis and the coil are in the same plane. c. in the +z direction d. No direction can be found since the orientation of the rectangular coil is not given.
How fast do electromagnetic waves travel?
a. At the speed of sound. b. At the speed of light. c. At one-half the speed of light. d. Six feet per day. e. At varying speeds depending on the electric and magnetic oscillations.