A thin infinitely large current sheet lies in the y-z plane. Current of magnitude Js per unit length along the z axis travels in the y-axis direction, which is up out of the page. Which diagram below correctly represents the direction of the magnetic field on either side of the sheet?
a.
b.
c.
d
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Potential of Point-Charges: Three point charges are placed at the following points in a horizontal x-y plane: +4.0 ?C is at (0.00 m, 0.50 m), + 1.0 ?C is at 0.20 m, 0.00 m), and -5.0 × ?C is at (0.20 m, 0.50 m). Calculate the electrical potential (relative to infinity) at the origin due to these three point charges. (k = 1/4??0 = 9.0 × 109 N ? m2/C2)
Fill in the blank(s) with the appropriate word(s).
Consider the five facts listed below. The nebular theory of the formation of the solar system successfully accounts for four of these facts, while one can be considered to be just a coincidence. Which fact is a coincidence?
A) Our solar system has an equal number of terrestrial and jovian planets. B) The planets all orbit around the Sun in nearly circular orbits in nearly the same plane. C) The planets divide into two major types, terrestrial and jovian. D) The solar system has many small bodies, and these are concentrated in the regions known as the asteroid belt, Kuiper belt, and the Oort cloud. E) There are many impact craters on the Moon.
If inflation really occurred, then our observable universe is only a tiny portion of the entire universe born in the Big Bang
Indicate whether the statement is true or false
As a spaceship moves away from you at half the speed of light, it fires a probe, also away from you at half the speed of light relative to the spaceship. Relative to you, the probe moves at
A) 0.80c. B) 0.87c. C) 0.90c. D) 0.95c. E) c.