At what distance from the central axis of a long straight thin wire carrying a current of 5.0 A is the magnitude
of the magnetic field due to the wire equal to the strength of the Earth's magnetic field of about 5.0 × 10-5 T? (?0 = 4? × 10-7 T ? m/A)
A) 5.0 cm B) 4.0 cm C) 2.0 cm D) 3.0 cm E) 1.0 cm
C
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Mass can flow from one star in a binary system to its companion through the first ____________________ point
Fill in the blank(s) with correct word
It's the June solstice, the Sun is at your zenith, and you have a UT clock that tells you it is midnight in Greenwich, England. Where are you?
A) on the Tropic of Cancer near the International Date Line B) on the equator near the International Date Line C) on the Tropic of Cancer, due south of Greenwich, England D) at latitude 25°S and longitude 49°E
When considering whether the density of the universe is above or below the critical density, what needs to be included in the measurement of density?
A) ordinary matter B) ordinary matter and dark matter C) ordinary matter, neutrinos, gravity waves and electromagnetic energy D) ordinary matter, dark matter and electromagnetic energy E) ordinary matter, dark matter, neutrinos, gravity waves, electromagnetic energy and dark energy
Several electrons are placed on a hollow conducting sphere. They
A) clump together on the sphere's outer surface. B) clump together on the sphere's inner surface. C) become uniformly distributed on the sphere's outer surface. D) become uniformly distributed on the sphere's inner surface. E) become randomly distributed on the shere's outer and inner surfaces.