Can the lines in the figure below be equipotential lines?
a.
No, because there are sharp corners.
b.
No, because they are isolated lines.
c.
Yes, because any lines within a charge distribution are equipotential lines.
d.
Yes, they might be boundary lines of the two surfaces of a conductor.
e.
It is not possible to say without further information.
d
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How many moons does Mars have?
A) none B) one C) two D) three E) four
Which of the following is the main reason for the fact that hydroelectric power plants are far more efficient than coal-fired electric power plants?
A) Hydroelectric plants have far fewer moving parts. B) Coal is only partially combustible, due to the presence of large amounts of impurities. C) The law of conservation of energy tells us that heat engines, such as hydroelectric plants, are more efficient than other forms of energy conversion. D) Since the hydroelectric plant is not a heat engine, it is not restricted by the second law of thermodynamics. E) Actually, hydroelectric plants are not significantly more efficient than coal-fired plants.
A segment of wire of total length 2.0 m is formed into a circular loop having 5.0 turns. If the wire carries a 1.2-A current, determine the magnitude of the magnetic field at the center of the loop
a. 79 mT b. 69 mT c. 59 mT d. 89 mT e. 9.4 mT
Briefly explain why radiation was trapped for 300,000 years during the era of nuclei, and why the cosmic background radiation broke free at the end of this era
What will be an ideal response?