An isolated, charged conductor is in electrostatic equilibrium. Which statement is correct?
a. The net charge is never zero inside the conductor
b. The electric field is always zero just outside the conductor.
c. The charge density on the conductor's surface is greatest where the surface is sharpest.
d. None of these statements are correct.
c
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Answer the following statement true (T) or false (F)
The primary evidence that has led astronomers to conclude that the expansion of the universe is accelerating comes from
A) observations of white dwarf supernovae. B) observations of the speeds of individual galaxies in clusters. C) measurements of the rotation curve for the universe. D) measurements of how galaxy speeds away from the Milky Way have increased during the past century.
Planets with orbital semimajor axes less than 0.1 AU are called ________
Fill in the blank(s) with correct word
The fact that many radio lobes emit more intensely from the side away from the galaxy suggests that
a. they are formed by material falling into the galaxy. b. they are powered by magnetic fields. c. they are excited by radiation from nearby galaxies. d. they are powered by the rapid rotation of the galaxy. e. they are created by jets from the galaxy emitting where the material is halted.