The picture below shows an end view of a loop conducting a conventional current in the direction shown. The magnetic field at the loop’s center 
A. points toward the viewer.
B. points away from the viewer.
C. points to the left.
D. points to the right.
E. is zero at the center.
F. is nonzero but has a direction we can’t determine without more information.
B. points away from the viewer.
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Carnot Engine: A Carnot engine operates between two reservoirs with unknown temperatures. If the Carnot engine operates at 67% efficiency, what is the ratio of the absolute temperatures of the reservoirs, Tc/Th?
A. 0.33 B. 0.0012 C. 0.0025 D. 0.66999999
What is the scientific status of astrology today?
A) Although astrology is implausible on general theoretical grounds, there is real observational evidence for it. B) It is implausible on general theoretical grounds, and there are no scientific observations to support it. C) Although it is theoretically plausible, and although real observational evidence exists for it, most scientists still will not accept astrology because it seems too unconventional or "kooky." D) Although there is no real observational evidence for this phenomenon, astrology is theoretically plausible. E) Astrology is plausible on general theoretical grounds, and there is also real observational evidence for it, which is why most scientists believe that astrology has real validity.
An object 30 cm in front of a concave spherical mirror (f = 10 cm) is moved toward the mirror until it is 20 cm from it. Sketch ray diagrams for these cases and estimate the factor by which the image magnification changes
Which of the following best describes the operation of a photovoltaic (solar) cell?