Four identical point charges (+6.0 nC) are placed at the corners of a rectangle which measures 6.0 m × 8.0 m. If the electric potential is taken to be zero at infinity, what is the potential at the geometric center of this rectangle?
A. 58 V
B. 63 V
C. 43 V
D. 84 V
E. 11 V
Answer: C
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The line representing latitude 45 degrees north runs through the state of Michigan. In Michigan, when is the Sun is directly overhead, at your zenith?
A) every day B) only on the spring and fall equinoxes C) only on the summer solstice, noon D) never
Which of the following statements best explains what we mean when we say that the electroweak and strong forces "froze out" at 10-38 second after the Big Bang?
A) These two forces first became distinct at this time. B) These forces are important only at temperatures below the freezing point of water—a temperature that the universe reached at an age of about at 10-38 second. C) Freezing out was a term coined by particle physicists who think that the Big Bang theory is really cool. D) Following this time, neither the strong nor electroweak forces were ever important in the universe again.
Assume that a uniform magnetic field is directed into this page. If a proton is released with an initial velocity directed from the bottom edge to the top edge of the page, which of the following describes the direction of the resultant force acting on the proton?
a. into the page c. to the right b. to the left d. out of the page
A +5.0-?C point charge is placed at the 0 cm mark of a meter stick and a -4.0-?C charge is placed at the 50 cm mark. What is the net electric field at the 30 cm mark? (k = 1/4??0 = 8.99 × 109 N ? m2/C2)
A) 4.0 × 105 N/C B) 5.0 × 105 N/C C) 9.0 × 105 N/C D) 1.4 × 106 N/C