A long straight wire lies on a horizontal table and carries an ever-increasing current northward. Two coils of wire lie flat on the table, one on either side of the wire. When viewed from above, the induced current circles
A)
clockwise in both coils.
B)
counterclockwise in both coils.
C)
clockwise in the east coil and counterclockwise in the west coil.
D)
counterclockwise in the east coil and clockwise in the west coil.
E)
no emf is induced in either coil.
D
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This diagram shows a probability map of electron positions in an atom. Blue represents a high probability of finding the electron, while black represents zero probability of finding the electron. Which statement is true as we understand it today?
A) The electron can "jump" from the inner blue region to the outer blue region without crossing the space in between. B) An electron in the inner blue region can never move to the outer blue region. C) We say that the black region is "excluded," in accord with the exclusion principle. D) The electron can move from the inner blue region to the outer blue region only by moving through the black region at high speed.
What causes the radio pulses of a pulsar?
A) The star vibrates. B) As the star spins, beams of radio radiation sweep through space. If one of the beams crosses Earth, we observe a pulse. C) The star undergoes periodic explosions of nuclear fusion that generate radio emission. D) The star's orbiting companion periodically eclipses the radio waves emitted by the main pulsar. E) A black hole near the star absorbs energy and re-emits it as radio waves.
A nearsighted person cannot see objects beyond 80 cm from his eyes
Which one of the following combinations represents the correct focal length and the refractive power of the contact lenses that will enable him to comfortably see the distant objects clearly? A) +80 cm, -1.3 diopters B) -80 cm, +1.3 diopters C) +80 cm, +1.3 diopters D) -1.3 cm, +1.3 diopters E) -80 cm, -1.3 diopters
A person spearfishing from a boat sees a fish located 3 m from the boat at an apparent depth of 1 m. To spear the fish, the person should aim
1.at the image of the fish. 2.above the image of the fish. 3.below the image of the fish.