A superconducting magnet uses
A) iron cores.
B) superconducting coils.
C) both of these
D) neither of these
Answer: B
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The wave-related quantity algebraically equivalent to 1/f is
a. ? b. T c. A d. ?
Each of the following lists two facts. Which pair of facts can be used with Newton's version of Kepler's third law to determine the mass of the Sun?
A) Earth is 150 million km from the Sun and orbits the Sun in one year. B) Mercury is 0.387 AU from the Sun and Earth is 1 AU from the Sun. C) The mass of Earth is 6 × 1024 kg and Earth orbits the Sun in one year. D) Earth rotates in one day and orbits the Sun in one year.
A current loop is oriented in three different positions relative to a uniform magnetic field. In position 1 the plane of the loop is perpendicular to the field lines. In positionS 2 and 3 the plane of the loop is parallel to the field as shown. The torque on the loop is maximum in
?
?
A. position 1. B. position 2. C. position 3 D. positions 2 and 3. E. all three positions.
Homogeneity and isotropy, taken as assumptions regarding the structure and evolution of the universe, are known as
A) the cosmological principle. B) Hubble's law. C) Wien's law. D) the Grand Unified Theory. E) Olbers's paradox.