A superconducting wire's chief characteristic is which of the following?
a. no resistance
c. an extremely great length
b. a large cross sectional area
d. an extremely high temperature
A
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General Questions: A crate is sliding down an inclined ramp at a constant speed of 0.55 m/s. The vector sum of all the forces acting on this crate must point
A. down the ramp. B. up the ramp. C. perpendicular to the ramp. D. vertically downward. E. None of these choices is correct.
Specular reflection occurs whenever
A. rays reflect from a surface. B. rays reflect in all directions from a surface. C. rays reflect at only one angle from a surface. D. parallel rays reflect at the same angle from a surface. E. visible light rays reflect.
The primary coil of a transformer has 100 turns and its secondary coil has 400 turns. If the ac current in the secondary coil is 2 A, what is the current in its primary coil?
A) 2 A B) 8 A C) 1/2 A D) 1/4 A E) 4 A
Series Resonance: In the figure, which of the phasor diagrams represents a series RLC circuit driven at resonance?
A. 1 B. 2 C. 3 D. 4 E. 5