The magnetic field lines about a current-carrying wire form _______.

A. eddy currents
B. circles
C. spirals
D. radial lines


Answer: B. circles

Physics & Space Science

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An object drops a distance h in a time of 6.3 s on the surface of the earth (neglecting air effects)

How long would it take the same object to drop the same distance on the surface of spherical asteroid X having a mass of 1.1 × 1022 kg and a radius of 4.0 × 105 m? (G = 6.67 × 10-11 N ? m2/kg2, Mearth = 5.97 × 1024 kg, Rearth = 6.38 × 106 m) A) 9.2 s B) 6.3 s C) 5.2 s D) 12 s E) 3.3 s

Physics & Space Science

Fiber optics has to do with:

a. the color of fabrics. b. light having fiber characteristics as well as wave and particle characteristics. c. string theory. d. none of the above.

Physics & Space Science

Two large closely-spaced parallel metal plates are uniformly and oppositely charged and the electric field between them is 7.6 × 106 N/C

(a) What is the charge per unit area on each plate? (b) If the plates are now moved two times farther apart, what is the electric field between the plates?

Physics & Space Science

The compound 6-aminohexanoic acid is used to make the condensation polymer nylon-6. Polymerization is not always successful, however, because of a competing side reaction. What is this side reaction?

A) One 6-aminohexanoic acid reacts with another and this reaction is favored in dilute solutions. B) One 6-aminohexanoic acid reacts with another and this reaction is favored in concentrated solutions. C) One end of the 6-aminohexanoic acid reacts with the other and this reaction is favored in dilute solutions. D) One end of the 6-aminohexanoic acid reacts with the other and this reaction is favored in concentrated solutions.

Physics & Space Science