The sign of the charge carriers in a current can be determined using the
A)
Hall effect.
B)
drift velocity.
C)
oil drop experiment.
D)
mass spectrometer.
E)
not given
A
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What is the upper limit of a brown dwarf's size?
a. no upper limit b. 0.50 solar masses c. 0.10 solar masses d. 0.08 solar masses e. less than 0.08 solar masses
A long solenoid (n = 1 200 turns/m, radius = 2.0 cm) has a current of a 0.30 A in its winding. A long wire carrying a current of 20 A is parallel to and 1.0 cm from the axis of the solenoid. What is the magnitude of the resulting magnetic field at a point on the axis of the solenoid?
a. 0.60 mT b. 0.85 mT c. 52 mT d. 0.40 mT e. 0.75 mT
Which of the following describes what will happen to a light ray incident on an air-to-glass boundary at less than the critical angle?
a. total reflection b. total transmission c. partial reflection, partial transmission d. partial reflection, total transmission
A model for combining the electromagnetic, weak and strong nuclear interactions into a single basic force is a(n)
a. electroweak theory. b. GUT. c. quark theory. d. generalized theory of relativity. e. theory of strangeness.