If a mile of 24-gauge copper wire has a resistance of 0.14 k? and the resistivity of copper is 1.7 × 10^?8 ? / m, what is the diameter of the wire? (1 mile = 1.6 km)
a. 0.40 mm
b. 0.50 mm
c. 0.63 mm
d. 0.80 mm
e. 0.25 mm
b
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An electron with a speed of 2.0 × 10^6 m/s moves into a uniform electric field of 325 N/C that is parallel to the electron's motion. How long does it take to bring the electron to rest? (me = 9.11 × 10^-31 kg, e = 1.6 × 10^-19 C)
a. 3.5 × 10^-8 s c. 2.3 × 10^-8 s b. 2.3 × 10^-6 s d. 1.2 × 10^-7 s
The near point of a normal human eye is infinity
Indicate whether the statement is true or false
If the intensity of an electromagnetic wave is 80 MW/m2, what is the amplitude of the magnetic field of this wave? (c = 3.0 × 108 m/s, ?0 = 4? × 10-7 T • m/A, ?0 = 8.85 × 10-12 C2/N • m2)
A) 0.82 mT B) 0.33 µT C) 10 T D) 14 T E) 0.58 mT
The standard kilogram is a platinum-iridium cylinder 39 mm in height and 39 mm in diameter. What is the density of the material?