Magnetic Field of a Long Wire: Two long parallel wires placed side-by-side on a horizontal table carry identical size currents in opposite directions. The wire on your right carries current directly toward you, and the wire on your left carries current directly away from you. From your point of view, the magnetic field at a point exactly midway between the two wires
A. points upward.
B. points downward.
C. points toward you.
D. points away from you.
E. is zero.
Answer: B
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The astronaut whose heart rate on Earth is 60 beats/min increases his velocity to v = 0.60c. Now what is his heart rate as measured by an Earth observer?
a. 100 beats/min c. 36 beats/min b. 75 beats/min d. 48 beats/min
Impedance: Which one of the following capacitances in series with a 100-? resistor and 15-mH coil will give a total impedance of 110 ? at 2.0 kHz?
A. 0.14 mF B. 46 ?F C. 10 ?F D. 0.56 ?F
Which produces an interference pattern when directed through two suitably spaced slits?
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Asteroid Ida was photographed by the Galileo spacecraft in 1993, and the photograph revealed that the asteroid has a moon, which has been named Dactyl
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