When an electric current exists within a conducting wire, which of the following statements describes the condition of any accompanying electric field?
a. must be zero
b. must be parallel to current flow
c. must be anti-parallel (opposite direction) to current flow
d. must be perpendicular to current flow
b
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Which of the following is the best explanation for the tremendous cliffs on Mercury?
A) They were probably carved in Mercury's early history by running water. B) They were probably formed by tectonic stresses when the entire planet shrank as its core cooled. C) They probably formed when a series of large impacts hit Mercury one after the other. D) They are almost certainly volcanic in origin, carved by flowing lava. E) They represent one of the greatest mysteries in the solar system, as no one has suggested a reasonable hypothesis for their formation.
Which of the following is not evidence for the Big Bang?
A. The background of microwave radiation B. The expansion of the universe C. The ratio of hydrogen to helium observed in stars D. The existence of protons and neutrons
What determines the chemical and physical properties of hydrocarbons?
A) the way the atoms are connected together B) the number of carbon and hydrogens C) the elements it is composed of D) the number of oxygen E) both A and B
The force that holds electrons within atoms is the
A. magnetic force between the electrons. B. gravitational force with the nucleus. C. nuclear force with the nucleus. D. electrical force with the nucleus.