A circular current loop is placed in an external magnetic field. How is the torque related to the radius of the loop?
a. directly proportional to radius squared
b. directly proportional to radius
c. inversely proportional to radius squared
d. inversely proportional to radius
A
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A white dwarf is always the remnant of a star that ____
a. ejected a planetary nebula b. was a member of a close binary system c. failed to ignite carbon d. failed to ignite helium e. became a red giant has a mass 20 times larger than our Sun
RLC Circuits: A series circuit has a 100-? resistor, a 0.100-?F capacitor, and a 2.00-mH inductor connected across a 120-V rms ac source operating at resonant frequency. What is the rms value of the voltage across the capacitor?
A. 54.0 V B. 120 V C. 150 V D. 533 V E. 170 V
Radiation: If the absolute temperature of an object is tripled, the thermal power radiated by this object (assuming that its emissivity and size are not affected by the temperature change) will
A. increase by a factor of 3. B. increase by a factor of 9. C. increase by a factor of 18. D. increase by a factor of 27. E. increase by a factor of 81.
What is the direction of 
in the wave as it passes P?
A. A B. B C. C D. D E. Toward the viewer. F. Away from the viewer. T. The vector is zero. G. AA H. BB I. CC J. DD