Maxwell developed his theory of electromagnetism by combining previous discoveries. He added his own original hypothesis that:
a. changing electric fields produce magnetic fields.
b. moving electric charges produce magnetic fields.
c. changing magnetic fields produce electric fields.
d. electric charges produce electric fields.
A
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Why is the Moon's surface cratered but Earth's is not?
A. When the dinosaurs died, their remains filled all Earth's craters. B. The Moon's stronger magnetic field attracted more iron asteroids. C. Meteors bounce off Earth's atmosphere. D. Earth's impact craters have been mostly obliterated by erosion and plate tectonics.
An ideal spring with a spring constant (force constant) of 22N/m is stretched from equilibrium to 2.9 m. How much work is done in the process?
A) 186 J B) 47 J C) 121 J D) 93 J
Pattern of stars within a constellation, or composed of a number of constellations
Rocks are found on the surface of another planet which appear to have been formed at the bottom of an ancient ocean. Given this, they are most likely to be classified as
A) metamorphic B) igneous C) meteoritic D) sedimentary