A circular current loop is placed in an external magnetic field. How is the torque related to the radius of the loop?
a. directly proportional to radius
b. inversely proportional to radius
c. directly proportional to radius squared
d. inversely proportional to radius squared
c
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The Greek letter designation conveys information about a star's location and brightness
a. True b. False Indicate whether the statement is true or false
The quantity volt is equivalent to which of the following?
a. J?m b. J?C c. C/? d. J/C
Why is it believed that the rings of Saturn could not have formed just as the planet itself formed?
a. Over time the solar wind should have blown away the particles in the rings. b. The particles in the rings should eventually fall into the planet in a short period of time. c. The rings are made of ice particles which would have been vaporized by the heat released as Saturn formed d. The outer planets do not have enough mass to hold on to the rings.
Which of the following telescopes must be used above Earth's atmosphere?
a. an optical telescope b. the VLBI telescope c. an x-ray telescope d. a radio telescope e. none of the above