The objectives of two astronomical telescopes have the same focal length but one objective has double the diameter of the other. An advantage of the telescope with the larger objective is
A)
its higher power.
B)
its greater aberration.
C)
its higher price.
D)
its brighter image.
E)
its lower aberration.
D
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Which of the following increases the magnetic moment of a rectangular coil the most?
1.doubling the coil's current and its number of turns 2.doubling the coil's area and doubling the magnetic field in which the loop is placed 3.doubling the magnetic field in which the coil is placed and doubling the angle between the magnetic field and the plane of the loop 4.All of these choices increase the magnetic moment by a factor of 4, thus they are all the "most".
The solid, nonliving part of the Earth is the
What will be an ideal response?
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