An electric field is set up between two parallel plates, each of area 2.0 m2, by putting 1.0 ?C charge on one plate and a -1.0 ?C charge on the other. The plates are separated by 4.0 mm
What is the magnitude of the electric field between the plates at a distance of 1.0 mm from the positive plate? A)
4.2 × 104 N/C
B)
1.4 × 104 N/C
C)
3.1 × 104 N/C
D)
0 N/C
E)
5.6 × 104 N/C
E
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In the condensation theory of the Moon's origin,
a. the Moon broke from a rapidly spinning Earth. b. Earth and its Moon formed from the same cloud of matter. c. the Moon formed elsewhere in the solar nebula and was later captured by Earth. d. the Moon formed when a very massive planetesimal smashed into the young Earth.
Star A and star B both have an apparent magnitude of 7.0, but star A is at a distance of 15 pc and star B is at a distance of 30 pc. Which statement below is correct?
A) Star A appears brighter than star B, but star B and star A have the same intrinsic brightness. B) Star B appears brighter than star A, but star B and star A have the same intrinsic brightness. C) Star A and star B appear to have the same brightness, but star B is intrinsically brighter than star A. D) Star A and star B appear to have the same brightness, but star A is intrinsically brighter than star B. E) It is impossible to determine how bright these stars are or appear to be relative to one another, given the information above.
In a two-body collision, if the kinetic energy of the system is conserved, then which of the following best describes the momentum after the collision?
a. must be less b. must also be conserved c. may also be conserved d. is doubled in value
A coaxial cable consists of a long, straight filament surrounded by a long, coaxial, cylindrical conducting shell. Assume charge Q is on the filament, zero net charge is on the shell, and the electric field is E1î at a particular point P midway between the filament and the inner surface of the shell. Next, you place the cable into a uniform external field –Eî. What is the x component of the
electric field at P then? 1. 0 2. between 0 and E1 3. E1 4. between 0 and -E1 5. - E1