A 2.0-m wire carries a current of 15 A directed along the positive x axis in a region where the magnetic field is uniform and given by B = 
mT. What is the resulting magnetic force on the wire?
A.
) NB.
) NC.
) ND.
) NE.
) NAnswer: B
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Click the fourth tab (labeled "Computer Models"), then explore how the graph changes as you click among the three buttons to its left. What is the primary message of the full graph (with all three curves shown)?
a. Climate models can successfully reproduce the major recent trends in temperature data by considering natural factors alone. b. Climate models are unable to account for the major recent trend in temperature data. c. Climate models successfully reproduce the major recent trend in temperature data only if both human and natural factors are included.
If a material is heated until it is green hot, then
A) it would liquefy immediately. B) it would be hotter than white hot. C) its molecules would be vibrating at nearly identical rates. D) it would be a strong absorber of red light. E) energy conservation would be violated.
The loop’s front end has emerged from the field.
A. Current flows clockwise in the loop. B. Current flows counterclockwise in the loop. C. Current does not flow in the loop.
A series circuit consists of a 50-Hz ac source, a 50-? resistor, a 0.50-H inductor, and a 60-?F capacitor. The rms current in the circuit is measured to be 3.1 A. What is the voltage amplitude of the source?
A) 220 V B) 160 V C) 510 V D) 180 V E) 270 V