An imaginary spherical surface has radius 1.5 m. Fully contained within and concentric with the spherical surface is a spherical conductor with a uniform surface charge density of 
What is its radius if the flux through the imaginary surface is electric field 1.5 m from its center is 
A. 3.2 cm
B. 4.7 cm
C. 9.5 cm
D. 6.4 cm
E. 3.9 cm
B. 4.7 cm
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What causes the meteor showers we witness on Earth? a. Earth passes through comet dust particles
b. Earth passes through remnants of an impacted asteroid. c. Earth passes through the asteroid belt. d. Earth passes through the coma of a comet. e. Earth passes through solar wind particles.
What evidence supports the idea that a collision between two spiral galaxies might lead to the creation of a single elliptical galaxy?
A) observations of some elliptical galaxies surrounded by shells of stars that probably formed from stars stripped out of smaller galaxies B) the fact that elliptical galaxies dominate the galaxy populations at the cores of dense clusters of galaxies C) observations of some elliptical galaxies with stars and gas clouds in their cores that orbit differently from the other stars in the galaxy D) observations of giant elliptical galaxies at the center of dense clusters that may have grown by consuming other galaxies E) all of the above
For the maximum induced emf in the coil of a generator, the term sin ?t has a value of one
Indicate whether the statement is true or false
Two bulbs are shown in a circuit that surrounds a region of increasing magnetic field directed out of the page. When the switch is closed,
A. bulb 1 glows more brightly. B. bulb 2 glows more brightly. C. both bulbs continue to glow with the same brightness. D. bulb 1 goes out. E. bulb 2 goes out.