Disconnect a small-voltage battery from a coil of many loops of wire and a large voltage may be produced by
A) the sudden collapse in the magnetic field.
B) latent energy in the battery.
C) the resistance of the battery to a change in polarity.
D) electrons already in the wire.
E) the electric field between the battery terminals.
Answer: A
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A bar magnet has a north pole and a south pole. This arrangement is referred to as a
A. monopole. B. dipole. C. bipole. D. equipole. E. oppopole.
If a person is farsighted the corrective lens will
a. take an object at the near point and form an image at 25 cm. b. take an object at 25 cm and form an image at the near point. c. take an object at infinity and form an image at 25 cm. d. take an object at infinity and form an image at the near point.
Studies of solar vibrations have revealed that
A) the Sun vibrates only on the surface. B) neutrinos from the solar core reach the solar surface easily. C) the Sun generates energy by nuclear fusion. D) they are caused by processes similar to those that create earthquakes. E) our mathematical models of the solar interior are fairly accurate.
Newton concluded that a force from the Earth had to act on the moon because
a. a force is needed to keep the moon in motion in its orbit. b. a force is needed to pull the moon outward. c. a force is needed to accelerate the moon toward Earth away from straight-line motion. d. the moon moved at a constant velocity in a straight line. e. all of the above