A segment of wire of total length 3.0 m carries a 15-A current and is formed into a semicircle. Determine the magnitude of the magnetic field at the center of the circle along which the wire is placed
a. 1.6 ?T
b. 4.9 ?T
c. 1.0 ?T
d. 9.8 ?T
e. 15 ?T
b
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What is an asterism?
a. A legend or folklore association to a grouping of stars b. Less formally defined group of stars outside the official 88 constellations c. The council of astronomers who defined the 88 constellations d. The northern pivot point of the celestial sphere e. Constellations close enough to a celestial pole that they do not appear to rise from the east and set in the west
In the hypothetical atomic interaction shown in figure C9.13, suppose the atoms initially are separated by a very large distance but are approaching each other with kinetic energy 
. Roughly how close will the atoms get to each other eventually?
A. r = 0
B. r = 0.05 nm
C. r = 0.2 nm
D. r = 0.4 nm
E. Other (specify)
Three 2.50-?C charges are placed on tiny conducting spheres at the ends of 1.00 m-long strings that are connected at 120° angles as shown below. The magnitude, in N, of the tension in any one of the strings is
?
?
A. 1.88 × 10?2. B. 3.25 × 10?2. C. 3.75 × 10?2. D. 6.50 × 10?2. E. 7.50 × 10?2.
The terms velocity and speed have identical meanings in physics
a. True b. False Indicate whether the statement is true or false