A uniformly charged rod (length = 2.0 m, charge per unit length = 3.0 nC/m) is bent to form a semicircle. What is the magnitude of the electric field at the center of the circle?
A. 64 N/C
B. 133 N/C
C. 48 N/C
D. 85 N/C
E. 34 N/C
Answer: D
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A comet’s plasma tail always points directly away from the Sun because __________.
a. of pressure exerted by the fast-moving charged particles in the solar wind b. centrifugal forces throw the tail outward as the comet travels around the Sun c. the comet’s nucleus overheats on the Sun-facing side, forcing energetic jets of gas to shoot out from the dark side d. the tail is left behind as the comet moves through its orbit
The reason the wavelike nature of a moving baseball is not noticed in everyday life is that
A) it doesn't have a wavelike nature. B) its wavelength is too small. C) its frequency is too small. D) its energy is too small. E) its speed is too small.
Four equal charges are located at the corners of a square of side d. If the magnitude of each charge is doubled, then what happens to the resultant force on each charge?
A) It is doubled. B) It is quadrupled. C) It increases by a factor of 8. D) It remains the same. E) None of the other choices is correct.
Which of the following scientists is credited with the discovery of the electron?
a) Planck b) Curie c) Maxwell d) Thompson e) Fermi