The magnetic field produced by a long straight current-carrying wire is
A)
proportional to both the current in the wire and the distance from the wire
B)
proportional to the current in the wire and inversely proportional to the distance from the wire.
C)
inversely proportional to the current in the wire and proportional to the distance from the wire.
D)
inversely proportional to both the current in the wire and the distance from the wire.
E)
independent of both the current in the wire and the distance from the wire.
B
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The range of diameters and luminosities displayed by elliptical galaxies is ____
a. similar to the range of spirals, and smaller than spiral galaxies on average b. similar to the range of spirals, and about the same as spiral galaxies on average c. similar to the range of spirals, and larger than spiral galaxies on average d. wider than the range for spirals, extending to much larger sizes than spiral galaxies e. wider than the range for spirals, extending to much smaller sizes than spiral galaxies
We say that the Moon is gibbous when
A) it appears to be more than half illuminated, but not full. B) it appears to be less than half illuminated, but not new. C) it is exactly half illuminated. D) we see a thin crescent of light. E) the Moon is visible in the morning.
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What will be an ideal response?
The oxygen in Earth's atmosphere
a. was manufactured inside stars. b. was added to the atmosphere by plant life. c. has grown more abundant since the origin of Earth. d. all of these e. none of these