Quiz 2 Version A

Once the bar begins to move the brightn the light

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Unformatted text preview: the bar begins to move, the brightn the light bulb is 19.3kg/m3 and its atomic weight is 197 amu. Find the drift speed of the electrons in a wire with circular cross section of radius 3mm and which is carrying a current of carrying .1A. • a. 1.4 ×10−4 m/s • b. 3.7 ×10−4 m/s • c. 5.9 ×10−5 m/s • d. 2.7 ×10−2 m/s 2. An aluminum wire of length 5L and a copper wire of length L have precisely the same B) × 10−8 Ω − resistance. A) decreases. of the two materials are: aluminum, 2.8 increases. m and The resistivity C) suddenly drops to zero. D) stays the same. copper 1.7 × 10−8 Ω − m. What is the ratio of the radius of the copper wire to the aluminum wire? • a. .05 • b. .12 • c. .35 • d. .87 3. How long is a wire made from a volume 100 cm3 of copper if its resistance is 8.5 ohms? The resistivity of copper is 1.7 x 10-8 Ω-m. 2 • a. 7.1 m • b. 1.7 x 102 m • c. 2.2 x 102 m • d. 3.0 x 103 m 4. An electric toaster requires 1 100 W at 110 V. What is t...
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This document was uploaded on 02/26/2014 for the course PHYS 1B at UCSD.

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