A 2.0-m long conducting wire is formed into a square and placed in the horizontal xy-plane. A uniform magnetic field is oriented 30.0? above the horizontal with a strength of 9.0 T. What is the magnetic flux through the square?
A) 1.1 T ? m2
B) 1.9 T ? m2
C) 2.3 T ? m2
D) 18 T ? m2
A
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A heat pump uses 200 J of work to output 300 J of heat into a heat reservoir at 200 K. What is the coefficient of performance for the heat pump?
A. 1.0 B. 1.5 C. 2.5 D. 2.8
Sunspots tend to occur in groups, or pairs, with the magnetic field around the pair resembling that around a bar magnet
a. True b. False Indicate whether the statement is true or false
Assume a uniformly charged ring of radius R and charge Q produces an electric field Ering at a point P on its axis, at distance x away from the center of the ring as in Figure OQ23.13a. Now the same charge Q is spread uniformly over the circular area the ring encloses, forming a flat disk of charge with the same radius as in Figure OQ23.13b. How does the field Edisk produced by the disk at P
compare with the field produced by the ring at the same point?
Metals are shiny because
A) they reflect 100% of incident light. B) they are poor absorbers of light. C) their electrons vibrate to the oscillations of any incident light. D) none of the above