Several electrons are placed on a hollow conducting sphere. They
A) clump together on the sphere's outer surface.
B) clump together on the sphere's inner surface.
C) become uniformly distributed on the sphere's outer surface.
D) become uniformly distributed on the sphere's inner surface.
E) become randomly distributed on the shere's outer and inner surfaces.
C
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Which form of electromagnetic radiation is absorbed by carbon dioxide and water vapor in our atmosphere?
A) visible light B) ultraviolet C) infrared D) radio E) gamma rays
What do Viking, Pathfinder, and the two Mars Rovers have in common?
A) They all found proof of life on Mars. B) They all could move over the surface of Mars to examine the rocks. C) They all were designed to investigate Mars' potential for life. D) They all are still transmitting data from Mars to Earth. E) They all proved Mars was too inhospitable for life to have every existed there.
Suppose that a particular chemical substance A is "pure" [contains no "impurities"], and that it can be chemically decomposed into two other pure materials B and C. What conclusion can be draw from this?
A) B and C must be elements. B) A must be a chemical compound. C) A must be an element. D) B and C must be chemical compounds. E) Nonsense--it is impossible to decompose a pure substance into two other materials.
A long hollow cylindrical conductor (inner radius = 2.0 mm, outer radius = 4.0 mm) carries a current of 24 A distributed uniformly across its cross section. A long wire which is coaxial with the cylinder carries an equal current in the opposite direction. What is the magnitude of the magnetic field 3.0 mm from the axis?
a. 0.82 mT b. 0.93 mT c. 0.70 mT d. 0.58 mT e. 0.40 mT