Each of two long straight parallel wires separated by a distance of 16 cm carries a current of 20 A in the same direction. What is the magnitude of the resulting magnetic field at a point that is 10 cm from each wire?
a. 57 ?T
b. 80 ?T
c. 64 ?T
d. 48 ?T
e. 40 ?T
d
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Ideal metals form close-packed crystal structures because the positive ______________cores pack like spherical billiard balls.
Fill in the blank(s) with the appropriate word(s).
A vase sits at rest on a table. If the action force is Earth pulling downward on the vase, the reaction force is the
A) table pushing upward on the vase. B) vase pulling upward on Earth. C) vase pulling upward on both the table and Earth. D) none of the above
For the gray opaque surface having the spectral emissivity given in the figure, determine the spectral reflectivity.
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