A flat coil of wire consisting of 20 turns, each with an area of 80 cm2, is positioned perpendicularly to a uniform magnetic field that increases its magnitude at a constant rate from 2.0 T to 6.0 T in 2.0 s. If the coil has a total resistance of 0.40 W, what is the magnitude of the induced current?
a. 500 mA
c. 140 mA
b. 70 mA
d. 800 mA
D
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Galileo's observation of sunspots showed that ________.
A. planets moved along elliptical orbits around the Sun B. the Sun was not a flawless sphere C. the stars could change D. Earth revolved around the Sun E. None of these choices is correct.
Two 100-W light bulbs of fixed resistance are to be connected to an ideal 120-V source
What are the current, potential difference, and dissipated power for each bulb when they are connected (a) in parallel (the normal arrangement)? (b) in series?
Most of the mass in the Milky Way Galaxy is located
A) in the halo (above/below the disk). B) within the disk. C) in the stars in the spiral arms. D) in the gas and dust. E) in the central bulge of the galaxy.
At the end of the Ordovician, many shallow-marine organisms went extinct due to
A) deep water predators. B) a long duration of high sea level. C) cooling temperatures, increased glaciation, and decreased sea level. D) cooling temperatures, increased glaciation, and a rise in sea level.